Preheat the oven to 375 degrees F. Grease a 24-cup mini muffin pan with nonstick spray.
In a large bowl, whisk together the applesauce, butter, eggs, milk, and vanilla extract.
In a medium bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
Gently stir the dry ingredients into the wet ingredients. VERY gently fold In sprinkles. Do not over-mix or they may start to bleed.
Divide the batter among the prepared muffin pan, using about 1 1/2 tablespoons batter in each cup. Top with additional sprinkles if desired.
Bake for 12-14 minutes, or until a cake tester inserted into the center comes out cleanly. Transfer to a wire rack, using a knife around the edges to loosen if needed, and let cool.