Step 1

Line 2 muffins pans with paper cupcake liners, or spray with cooking spray.

Step 2

In a medium bowl. sift together flour, baking soda and salt.

Step 3

In a small bowl, mash bananas and milk with a fork. (You can omit the milk if you want, it just helps to get a creamier consistency with the mashing). Set aside.

Step 4

In a stand mixer on medium speed, cream together butter and sugar until light and fluffy; about 2 minutes. Stir in egg and vanilla to combine.

Step 5

Stir in flour mixture to combine, then stir in bananas, sour cream and optional walnuts.

Step 6

Divide batter among 24 muffins cups (an ice cream scoop helps to keep them equal).

Step 7

Bake at 350 degrees for about 25 minutes, or until tops are golden brown and a toothpick inserted in the center of a muffin comes out clean.

Step 8

Cool on a wire rack.