Made with fresh blueberries, this 1st Birthday Smash Cake recipe is easy, allergy-friendly, and made without added sugar. It has the most delish Blueberry Frosting, and you can bake the cakes a day ahead if needed. So yummy!

sliced blueberry birthday cake on colored plates.

Smash Cake Recipe

When my kids were turning 1, I always wanted a cake that was filled with natural sweetness from fruits (or veggies), and that would work as a Smash Cake—or a cake we could slice and share. This blueberry cake, which is just perfect for a first birthday, has so much flavor from bananas and berries that you don’t need any other sweetener.

And the frosting is such a fun bright blue color from freeze-dried berries.

This egg-free birthday cake is a great option for kids with some allergies and it’s also just an easy smash cake to make if you have a kiddo who loves blueberries.

Ingredients You Need

This 1st birthday cake includes whole grain flours, bananas, blueberries, and cinnamon for a flavorful, yet really simple cake. Here’s a look at what you’ll need for the recipe.

ingredients in blueberry first birthday cake on counter.
  • Bananas: You’ll want them to be very ripe with lots of brown spots, which indicate sweetness.
  • Whole wheat flour: This flour has nutrition and fiber but also absorbs moisture well so it helps the cake bake through well.
  • Oat flour
  • Baking powder and baking soda
  • Cinnamon
  • Butter: I prefer to bake with unsalted butter so I can control the level of salt in the cake.
  • Blueberries: Fresh or frozen blueberries are stirred into the batter so they’re evenly distributed throughout the cake.

TIP: This cake is a no-added-sugar so the natural sweetness from the fruit shines through. It’s a perfect first cake for a baby!

Step-by-Step Instructions

This smash cake is very easy to make, even if you aren’t a regular baker. Here’s a look at the steps involved. Scroll down to the bottom of the post for the full info.

how to make blueberry first birthday cake step by step process.
  1. Start with very ripe bananas. The browner they are, the sweeter they will be! Add to a blender and blend into a puree.
  2. Add to a medium bowl with the rest of the ingredients.
  3. Prepare your 6-inch cake pans by coating with nonstick spray and adding a round of parchment paper. This will ensure that the cakes come out of the pans easily once they are baked.
  4. Divide the batter between the pans. Bake and let cool in the pans.

TIP: You may also like my Vanilla Oat Smash Cake.

How to Make Natural Frosting with Blueberries

Here’s a look at the general process for making the blueberry frosting.

how to make blueberry frosting step by step process in grid.
  1. Place the freeze dried fruit into a blender or spice grinder. Blend to make a fine powder.
  2. Add the rest of the ingredients and the powder to a medium bowl. Beat.
  3. Spread some of the frosting onto one cake. Top with the second cake and add more frosting on top.
  4. Frost the sides to finish.

What’s the texture of this cake like?

This cake is moist and fairly sturdy for being made without eggs. It is a little denser than a standard birthday cake due to the banana and whole wheat flour.

How sweet is the cake?

This cake doesn’t have any added sugars, so the sweetness comes from the bananas and blueberries. It’s not very sweet like a traditional cake, but it has a pleasant flavor that both of my daughters enjoyed when they taste-tested it.

TIP: Do not expect this to taste as sweet as a store-bought birthday cake because it’s not!

Eggless Cake Recipe

I regularly get requests for egg-free recipes, so I wanted this cake to be made without eggs but taste as good for those kids who can have eggs, too. It holds together nicely and has a good texture without the inclusion of eggs.

Can I make the frosting a different color?

You can! You can use any kind of freeze-dried fruit. Strawberries to make a pretty pink color. Raspberries may be too tart, but you can certainly try and see what you think.

sliced first birthday cake with blueberries on stand

Make-Ahead Birthday Cake

You can bake the cakes a day ahead of when you plan to serve if that helps you to stay on top of your celebration to-do list. Simply let them cool completely in the pans, then store in the fridge in airtight containers or zip-top gallon bags. (I put the cakes still in the pans right into zip-top bags and stored them that way—so easy!)

1st Birthday Cake for Girls

This is a pretty cake for a birthday girl, especially one who loves fresh berries. You can change up the color by using different freeze-dried fruit if you’d like.

First Birthday Cake for Baby Boys

I love that this cake is so fresh and flavorful for a first birthday. For a girl or a boy!

frosted blueberry smash cake with blueberries on top

How to Store

You can make the cakes a day ahead. Let cool and store in the fridge in airtight containers. Store any leftovers in the fridge in an airtight container.

Plan to frost the cake on the same day as you want to serve it. It can hang out in the fridge for a few hours as needed. Let it sit at room temperature for at least 30 minutes before serving to allow it to soften up a little, as it will firm up in the fridge.

Best Tips for Success

  • Dairy-free: Use melted coconut oil instead of the butter in the cake and plain or vanilla nondairy Greek yogurt instead of cream cheese in the frosting. (If using vanilla nondairy yogurt, omit the vanilla extract.)
  • Gluten-free: Use cup-for-cup gluten-free flour instead of whole wheat.
  • To make this with homemade oat flour: Blend ¾ cup rolled oats in a blender or food processor for about 30 seconds until they resemble a flour. Measure out ½ cup of your oat flour and proceed with the recipe.
  • You can also use freeze-dried strawberries instead of blueberries to make a pink-frosted cake.
  • To make this as a larger two-layer 8-inch cake, follow the same steps but bake for 18-20 minutes.
  • Sweeten frosting to taste, if desired, with 2-3 tablespoons maple syrup or honey.

Related Recipes

I’d love to hear your feedback on this recipe if you try it, so please rate and comment below!

sliced blueberry birthday cake on colored plates.

Blueberry Smash Cake (First Birthday Cake)

This naturally sweetened birthday cake is delicious and easy to make ahead of time. Plan ahead to let 4 bananas ripen to have brown spots to ensure that the cake has plenty of natural sweetness.
4.97 from 28 votes
Prep Time 15 minutes
Cook Time 22 minutes
Total Time 32 minutes
Cuisine American
Course Dessert
Calories 405kcal
Servings 8 -10 (or one smash cake)


Blueberry Cake

  • 4 medium bananas (very ripe with lots of brown spots is best for flavor)
  • cup whole wheat flour
  • ½ cup oat flour
  • 1 teaspoon baking powder
  • ½ teaspoon baking soda
  • 1 teaspoon cinnamon
  • ¼ cup unsalted butter, melted and cooled slightly (or plain whole milk yogurt)
  • 1 cup blueberries

Blueberry Cream Cheese Frosting

  • 1 cup freeze-dried blueberries
  • 12 ounces cream cheese (softened at room temperature; I prefer full fat)
  • 3 tablespoons unsalted butter (softened at room temperature)
  • teaspoons pure vanilla extra


  • Preheat the oven to 350 degrees F. Grease two 6-inch cake pans with nonstick spray and line with rounds of parchment paper. Grease again with nonstick spray.
  • Add the bananas to a blender. Blend into a puree. Measure out 1 ½ cups.
  • Add to a bowl with the remaining ingredients. Stir together gently.
  • Divide in half and pour into prepared cake pans. (You’ll use about 1 ½ cup batter in each.)
  • Bake for 22-24 minutes or until a cake tester inserted into the center of a cake comes out cleanly.
  • Remove from oven and place on a wire rack. Let cool completely in the pan.
  • Make the Blueberry Cream Cheese Frosting. Add the freeze-dried blueberries to a blender or clean spice grinder. Grind into a powder. Measure out ¼ cup of the powder and add to a medium bowl. Add the cream cheese, butter, and vanilla extract. Beat until very smooth with a handheld electric mixer. 
  • When ready to frost, place one cake, parchment paper removed, on a cardboard cake round or plate. Top with ⅓ cup of the frosting. Remove the parchment paper from the second cake and place on top of the frosting. Add the rest of the frosting on top and spread over the top and around the sides.
  • Sprinkle on additional freeze-dried or fresh blueberries if desired.


  • Dairy-free: Use melted coconut oil instead of the butter in the cake. For the frosting, use plain or vanilla nondairy Greek yogurt instead of cream cheese and omit the butter. (If using vanilla nondairy yogurt, omit the vanilla extract.)
  • Gluten-free: Use cup-for-cup gluten-free flour instead of whole wheat.
  • You can also use freeze-dried strawberries instead of blueberries to make a pink cake.
  • To make this as a larger two-layer 8-inch cake, follow the same steps but bake for 18-20 minutes.
  • Sweeten frosting to taste, if desired, with 2-3 tablespoons maple syrup or honey.
  • You can make the cakes a day ahead. Let cool and store in the fridge in airtight containers.


Calories: 405kcal, Carbohydrates: 39g, Protein: 7g, Fat: 26g, Saturated Fat: 15g, Polyunsaturated Fat: 2g, Monounsaturated Fat: 7g, Trans Fat: 1g, Cholesterol: 73mg, Sodium: 312mg, Potassium: 400mg, Fiber: 5g, Sugar: 13g, Vitamin A: 940IU, Vitamin C: 9mg, Calcium: 92mg, Iron: 1mg
Tried this recipe?Rate in the comments and tag @yummytoddlerfood on IG!

This post was first published July 2019.

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  1. Hi there! I am planning on making this for my son’s smash cake and wanted to know if it’s necessary to use two types of flour or can I use cake flour for both?

    1. Hi- I don’t know that it will work the same with all cake flour. Whole wheat is much denser and absorbs liquids more readily, so I worry that subbing cake flour would make the cake too tender to hold well. That’s my best guess anyway!

  2. 5 stars
    Hi there! This looks amazing and I plan to make it for my daughter‘s birthday! Question, can I use three, four-inch pans instead?

    1. Yes, though you’ll want to reduce the baking time since the cakes will be smaller. I would guess 16-18 minutes. Enjoy the birthday!

  3. Hi! This looks delicious and would love to try for my daughter’s first birthday next week! She loves raspberries though- how would you recommend using raspberries instead of blueberries? Thanks!!

    1. You could use raspberries instead, though be sure that your banana is super ripe as raspberries aren’t as sweet as blueberries.

  4. Hi!
    Great recipe, thank you for sharing! I would like to make it an eggless strawberry cake. Do you recommend adding diced strawberries or substituting some of the banana puree with strawberry puree? TIA

    1. Hi- I would sub diced strawberries for the blueberries in the cake and use freeze-dried strawberries instead of blueberries in the frosting. Enjoy!

  5. 5 stars
    I made this for my son’s birthday party. only had 8” pans and thought although it would be fine and just a little bit thinner, but when I poured the batter into them they looked way too thin (about 1cm thick). I ended up pouring the batter into one tin and making another whole batch to pour into the other tin. I used 2 x packs of Philadelphia and extra butter for the frosting (for the bigger cake). I topped up the banana with 1 added egg and an extra tsp vanilla to each cake, and 1tbs of maple syrup to the frosting. It tasted amazing, had lots of great comments from guests and turned out perfectly 🙌🏽😋😋 I’ll be making another small version for my son’s actual birthday for him to smash!

  6. What should the batter be like? Mine was very sticky and thick
    It did not really rise much. Anyone else have the same outcome? Flavor is ok but texture is off.

    1. It is a very thick batter, but if the baking soda is fresh, it should help it rise and be normal cake consistency. Maybe make sure it wasn’t expired or older? That would be the most likely explanation.

  7. This recipe looks wonderful. I am planning to make it for my son’s birthday. Can I bake this in 2 ceramic 5 inch pans per the same instructions?

    1. You can use 5 inch pans, but since the batter in each will be thicker as the pans are slightly smaller than what I used, the baking time will be slightly longer. Maybe an extra 2-4 minutes? Keep an eye on the middle of the cakes as that will be the area that takes longest to cook and test with a cake tester. I’d love to hear how it goes!

  8. Hi Amy! Any tips on what to do for a baby allergic to oats? Can I just sub whole wheat or AP flour instead of the oat flour?

    1. Hi- I think I’d use all purpose flour. The baking time may be a few minutes in either direction, but I think it would turn out very similarly. I haven’t tried it that way, but since it’s mostly whole wheat flour as it is, it should be okay!

  9. Hello, this looks divine! I will be trying them out as cupcakes first. But how long would the cake last in the fridge?

    1. You could make the cakes ahead of time and store them in an airtight container (I’d do a storage bag with as much air removed as possible) in the fridge for up to 2 days I think. I would frost closer to when you plan to serve or the frosting with the blueberries may discolor a little.

    2. 5 stars
      I teste this recipe out and it was enjoyed by little ones and adults alike! If you made the cupcake variation how long did you cook them for?