Banana Bread Brownies

Ingredients (19)

• Brownies:
• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1 teaspoon cinnamon
• 1/2 teaspoon salt
• 1/2 cup unsalted butter, softened
• 1/2 cup light brown sugar, packed
• 1/2 cup granulated sugar
• 2 large eggs
• 3 ripe medium bananas, mashed (about 1 cup)
• 3/4 cup buttermilk
• 1 tablespoon vanilla
• 3/4 cup chopped walnuts
• Frosting:
• ⅓ cup unsalted butter
• 21/2 cups powdered sugar
• 1/4 cup half and half cream
• 2 teaspoons vanilla