Preheat oven to 350 degrees F (180 degrees C). Lightly coat a 9x13-inch pan with cooking spray.
Prepare the Chocolate Fudge Brownie Mix (1 package) according to package directions. Spread the batter in the pan and set aside.
In a large bowl, beat Cream Cheese (8 ounce) with hand-held mixer until fluffy. Add Sweetened Condensed Milk (1 can) and Creamy Peanut Butter (1/2 cup) and beat until smooth. Stir in the Reese's Pieces Candies (16 ounce).
Spread evenly over brownie batter. Bake for 40 minutes or until cheesecake layer is set and edges are golden brown.
Cool for 30 minutes.
Refrigerate for 30 minutes.
In a small microwaveable bowl, heat in the Panasonic Microwave Oven the Milk Chocolate Chips (12 ounce) with the Whipping Cream (5 tablespoon) for 1 minute, or until completely melted. Stir until smooth.
Spread over cheesecake layer. Sprinkle the Reese's Peanut Butter Cups (12) over the top and enjoy! Cooking results may vary depending on microwave oven used.