Base1 box (1 lb 6.5 oz) Betty Crocker® Original Supreme brownie (I used dark chocolate betty crocker brownies) mix water, vegetable oil and eggs called for on brownie mix box
1/2 cup butter, softened
1/2 cup creamy peanut butter
2 cups powdered sugar
2 teaspoons milk
1 cup semisweet chocolate chips
1/4 cup butter
Heat oven to 350°F. Grease bottom only of 13x9-inch pan with cooking spray or shortening. In medium bowl, stir brownie mix, pouch of chocolate syrup, water, oil and eggs until well blended. Spread in pan. Bake 28 to 30 minutes or until toothpick inserted 2 inches from side of pan comes out almost clean. Cool completely, about 1 hour.In medium bowl, beat filling ingredients with electric mixer on medium speed until smooth. Spread mixture evenly over brownie base.In small microwavable bowl, microwave topping ingredients uncovered on High 30 to 60 seconds; stir until smooth. Cool 10 minutes; spread over filling. Refrigerate about 30 minutes or until set. For brownies, cut into 9 rows by 4 rows. Store covered in refrigerator. (I take it out or the fridge about 15 minutes before serving. This allows the chocolate on top to soften a little)Follow High Altitude directions for 13x9-inch pan on brownie mix box.