Banana Bars with Cream Cheese Frosting
from https://www.tasteofhome.com/

One reviewer added an extra banana for more banana flavor (and I saw a similar recipe do the same). One other reviewer added 1/2 walnuts to the batter.

Include mix-ins:

You can bake the banana bars in a different-sized pan. Instead of a jelly-roll pan, try a 13×9-inch pan or two 9-inch round pans. Keep in mind, these bars will be thicker and may need a bit more time to bake. You can also bake the batter in muffin tins for cupcakes. [For a 9x9-inch pan, use 2/3 recipe.]

1/2 cup butter, softened
1-1/2 cups sugar
2 large eggs, room temperature
1 cup sour cream
1 teaspoon vanilla extract
2 cups all-purpose flour
1 teaspoon baking soda
1/4 teaspoon salt
2 medium ripe bananas, mashed (about 1 cup)

frosting:
1 package (8 ounces) cream cheese, softened
1/2 cup butter, softened
2 teaspoons vanilla extract
3-3/4 to 4 cups confectioners' sugar

Preheat oven to 350°. In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Add eggs, sour cream and vanilla. Combine flour, baking soda and salt; gradually add to creamed mixture. Stir in bananas.

Spread into a greased 15x10x1-in. baking pan. Bake until a toothpick inserted in the center comes out clean (do not overbake), 20-25 minutes. Cool completely.

For frosting, in a large bowl, beat cream cheese, butter and vanilla until fluffy. Gradually beat in enough confectioners' sugar to reach desired consistency. Frost bars. Store in the refrigerator.

Yield: 4 dozen