Banana Chocolate Chip Bars (with Brown Butter Brandy Frosting!)

Ingredients

• 1/2 cup unsalted butter (softened)
• 1 cup granulated sugar
• 1/3 cup dark brown sugar (packed)
• 1½ tsp. baking powder
• 1/2 tsp. baking soda
• 1/2 tsp. salt
• 1 tsp. cinnamon
• 1/4 tsp. nutmeg
• 3 overripe bananas (mashed (~1 cup))
• 2 large eggs
• 1/3 cup vegetable oil
• 2 cups all-purpose flour
• 1 cup mini chocolate chips + 1/3 cup for garnishing on frosting
• 1 tsp. vanilla extract
• 1/3 cup unsalted butter
• 2 cups powdered sugar (sifted)
• 1 Tbsp. brandy*
• 1 Tbsp. milk
• 1 tsp. vanilla