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1. Preheat oven to 350 degrees (or 325 depending on your pan, just read the back of the box!) and grease aa 8 or 9 inch pan! I also used parchment paper.
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2. Combine brownie mix, egg, oil and water. Pour into pan.
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3. In a small bowl combine peanut butter, melted butter and powdered sugar. Drop spoonfuls into the pan with the brownie batter and then use a knife to swirl. See video!
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4. Bake for 30-35 minutes depending on the size of your pan and how gooey your like your brownies.
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5. Cover the baked brownies with marshmallows and then return to the oven on BROIL for 2-3 minutes, but watch the marshmallows brown or else you may burn them! Each oven is different and the mallows can go from perfectly toasted to burned in a few seconds.
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6. Let cool and enjoy!