Heat oven to 350 degrees.(If using glass pan 325 degrees.)Grease 13x9x2 in.
pan. In large bowl with spoon or wire whisk, stir together butter, sugar and
vanilla. Add eggs:stir until well blended.Stir in flour,cocoa, baking powder
and salt: blend well. Reserve 2 cups of batter and set aside.Spread
remaining batter in prepared pan.Arrange peppermint patties in single layers
over batter,about 1/2 in. apart.Spread reserved 2 cup of batter over
patties. Bake 50 to 55 min. or until brownies begin to pull away from sides
of pan. Cool completely in pan .Cut into squares. About 36 brownies.