Banana Bread Brownies

 

• 
  
• 2 eggs
• 3 mashed bananas medium to large
• 1 1/2 cups sugar
• 1 cup sour cream
• 1/2 cup unsalted butter, softened
• 2 teaspoons vanilla extract
• 2 cups flour
• 1 teaspoon baking soda
• 3/4 teaspoon salt
• 1/2 cup walnuts,chopped
• 
  
• Frosting:
• 1/2 cup butter
• 3 cups powdered sugar
• 1 1/2 teaspoons vanilla extract
• 3 tablespoons whole milk