Peppermint Patty Brownies

Ingredients

• 1 1/2 cups butter, softened
• 3 cups sugar
• 5 large eggs
• 1 tablespoon vanilla
• 2 cups all-purpose flour
• 1 cup baking cocoa
• 1 teaspoon baking powder
• 1 teaspoon salt
• 12 ounces small chocolate-covered peppermint patties
• 1/2 cup butter at room temperature
• 2/3 cup Hershey’s cocoa powder
• 1 teaspoon instant espresso powder ((not grounds))
• 3 cups powdered sugar
• 1/3 cup milk or half and half
• 1 teaspoon vanilla bean paste or vanilla extract