Add to a freezer bag. Press out as much air as you can, or seal almost all the way closed and suck out the air like a DIY vacuum sealer. (You can use a straw if you prefer.) Seal.
Freeze for at least 4 hours and up to 6 months.
To thaw, transfer the bag or individual muffins to the fridge to thaw overnight or room temperature for about an hour.
Serve or warm in 15-second increments in the microwave.
You can also warm a muffin straight from the freezer. Place it onto a heat-safe plate and warm in 15-second increments until heated through. (Do not overheat, as muffins can get very hot very fast.)
Notes
Let the muffins cool fully before storing.
Try to remove as much air as possible from the bag before sealing to help reduce potential ice crystals.
Thaw overnight in the fridge or on the counter at room temperature as desired.
Freeze for up to 6 months.
Heat in the microwave for 15-30 seconds to warm through and serve. (You can also serve them at room temperature.)