Having a stash of overripe bananas in my fruit bowl is part of my life as a mom. My kids go to to the grocery store, beg that I buy them bananas, and then proceed to eat exactly one before leaving the rest to rot on the counter for a week.
Combine gluten-free flour blend, almond flour, brown sugar, baking powder, baking soda, xanthan gum, and salt. Add the wet ingredients to the dry ingredients and mix until just combined.
Sprinkle the reserved chocolate chips on top of the batter in each muffin cup. Bake for 20-25 minutes or until a toothpick inserted into the center comes out clean.