These Banana Bread Cookies are soft, moist, and full of banana flavor. You can add mini chocolate chips and nuts if you like.
In a small saucepan melt the butter until it turns brown and smells nutty. It will foam up and turn brown around 5 minutes so make sure to keep an eye on it. Remove from heat immediately and pour into a separate bowl so it doesn't continue to brown. Quickly stir in the white and brown sugars. Let sit for about 5 minutes to cool. Pour into a large mixing bowl and add the egg and vanilla. Mix in banana and sour cream.
Refrigerate dough for at least 30 minutes. Drop a one inch ball of dough onto cookie sheets 2-inches apart lined with parchment paper and bake at 350 degrees for 10-12 minutes or until edges are brown. Do not overbake these! Cookies will get more moist as they sit. Keep in an airtight container to store.
Source: Just a Pinch