Preheat Oven to 350°.
Grease pan.
Combine brownie ingredients in a large bowl and mix well.
Pour batter into pan.
Heat Peanut butter in microwave safe bowl for 10-15 seconds in microwave.
Spoon onto top of brownies.
Heat marshmallow fluff for 10-15 seconds in microwave.
Spoon onto top of brownies.
Use butter knife to swirl peanut butter and marshmallow fluff into brownie batter.
Bake for 20-25 minutes or until a toothpick comes out clean.
Toppings Directions.
In microwave safe bowl combine ingredients.
Microwave for 1 - 2 minutes. Stop and Stir every 10-15 seconds.
Spoon on top of baked brownies and spread out evenly.
Place in refrigerator for 90 minutes or overnight.