Scrumptious Peppermint Brownies

Heat oven to 350°F (175°F). Grease a 13 x 9 x 2-inch baking pan; set aside. In a small bowl, combine flour, cocoa, baking powder and salt; set aside. In a large bowl, stir together butter, sugar and vanilla. Add eggs; beating until well blended. Stir in flour mixture, blending well. Reserve 2 cups batter. Spread remaining batter in prepared pan. Arrange peppermint patties about 1/2-inch apart in single layer over batter. Spread reserved 2 cups batter over patties. Bake 45 to 50 minutes or until brownies begin to pull away from sides of pan. Cool completely; cut into squares.