Mint Chocolate Brownies

York peppermint patties are the secret ingredient here. From cooks.com.

Ingredients

1 1/2 cups butter, melted
3 cups sugar
1 tablespoon vanilla
5 eggs
2 cups flour
1 cup Hershey cocoa
1 teaspoon baking powder
1 teaspoon salt
24 small York peppermint patties

Instructions

In large bowl, stir together butter, sugar and vanilla. Add eggs, stir until blended well. Stir in flour, cocoa, baking powder, and salt. Blend well. Reserve 2 cups of batter; set aside. Spread remaining batter in prepared pan. Arrange peppermint patties in single layer over batter, about 1/2 inch apart. Spread reserved 2 cups of batter over patties. Bake in a greased 9 by 13-inch pan at 350 degrees for 50-55 minutes.