Banana Chocolate Chip Muffins

Banana Chocolate Chip Muffins

2 1/4 cups all-purpose flour
1 tablespoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
2 1/4 cups ripe mashed banana
1/2 cup granulated sugar
1/2 cup sour cream (not low fat)
1/4 cup vegetable oil
3 large egg yolks
1 teaspoon vanilla extract
1 cup pecan or walnut pieces
1 cup chocolate chips

Preheat the oven to 400 degrees. Mix the flour, baking powder, baking soda, and salt together in a large bowl. In another bowl, mix the mashed banana, sugar, sour cream, vegetable oil, egg yolks, and vanilla together. Add wet ingredients to the dry and stir just until the ingredients are mixed well. Fold in the nuts and chips. Fill the well-greased tins nearly full. Use all the batter for twelve standard muffins. Bake for 8 minutes at 400 degrees. Reduce the temperature to 350 degrees and bake for another 8 to 10 minutes or until done. Let sit for five minutes and remove the muffins from the pan to a rack to cool.