Preheat oven to 350 degrees F
Cream softened (room temperature) butter and sugar together until fluffy and creamy.
Fold in mashed banana and pumpkin puree and stir until all smooth.
Add beaten eggs
Add vanilla and sour cream
Mix together flour, spices, baking powder and soda, salt and combine with the wet ingredients to make a smooth batter. Do not overmix.
Stir in chocolate chips
Spray muffin tin with cooking spray of your choice, and/or muffin liners
Pour batter into muffin pans until they are ⅔ full.
Bake for 18 - 23 minutes** or until a toothpick inserted in the center comes out clean.
Set aside until cooled completely to remove from the pan.
*Flour notes:
Substitute ¼ buckwheat flour for more protein and nutty taste
You can also substitute for gluten free flour.
**If using a large muffin pan, bake for about 30 minutes, check at 29 minutes.