Preheat the oven to 350F and line a muffin pan with liners.
Pour the apple pie filling into a large bowl and cut the apples into very small pieces.
Add the cake mix and eggs and stir to combine until you have a smooth batter.
Divide the batter evenly between 18 muffin tin cavities and bake for 20-22 minutes, until a toothpick inserted into the center comes out clean.
Remove from the oven and cool for 1 hour.
Mix the powdered sugar and milk together in a small bowl and drizzle over the muffins.
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Notes
Use silicone liners if at all possible, as it makes them easier to come out without tearing.Adjust the glaze with a tiny bit more milk if you’re finding it too thick.This recipe makes 18 muffins, not the standard 12, so have a second pan or extra liners ready.Watch for the toothpick, not just the clock: they're usually done around 20-22 minutes, but pull them once a toothpick comes out clean.