One Bowl Banana Muffins

These quick and easy muffins have been a favorite snack during lockdown. There is no reason to toss overripe bananas, as they have tons of uses. My kids love these for breakfast too. They freeze beautifully.
Ingredients:
1 1/2 cups all purpose flour
1 tsp EACH baking powder and baking soda
1/2 tsp salt
3 large, ripe mashed bananas
3/4 cup sugar
1 tsp vanilla
1 tsp cinnamon
1/3 cup melted, cooled unsalted butter
1 large egg
3/4 cup optional add ins of your choice.

Prepare a 12 cup muffin tin with sprayed liners. Have a lucky child ready to lick excess batter. You count as said child as well.
Mix all in a bowl until combined. Sprinkle each top with a mixture of extra cinnamon and sugar if desired (we desire). Bake at 350 for about 20 minutes, possibly between 18 and 22 (each oven is different). Use a toothpick to test if ready.