3/4 c. butter, melted
1 1/2 c. sugar
1 1/2 tsp. vanilla
3 eggs
3/4 c. flour
1/2 c. cocoa
1/2 tsp. baking powder
1/2 tsp. salt
1 c. chocolate chips or peanut butter chips (optional)

Heat oven to 350 degrees. Grease 8 x 8 x 2 inch pan. In medium mixing bowl, blend melted butter, sugar, and vanilla. Add eggs; beat well with spoon. Combine flour, cocoa, baking powder and salt; gradually add to egg mixture, beating until well blended. Stir in chips. Spread into prepared pan; bake 40-45 minutes or until brownies begin to pull away from sides of pan. Cool completely.