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1
Prepare a 13 x 9 baking pan by spraying it lightly with non-stick spray or flouring and greasing it. Set it aside. Preheat oven to 350 F.
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2
For the crust:
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3
In a large bowl, cream butter and sugar until smooth and well-mixed. Mix in egg and vanilla then set aside. In a separate bowl, combine the dry ingredients. Pour the dry ingredients into the wet ones, mixing until blended.
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4
Spread evenly into the prepared pan and bake for 15 minutes.
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5
For the middle layer:
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6
Once the crust is done, remove it from the oven and pour marshmallows on top. Set aside.
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7
Over medium heat in a mid-sized saucepan, melt the chocolate and peanut butter chips in the sweetened condensed milk until you have a creamy smooth pot of loveliness. Remove from heat and allow to cool for 2 minutes before folding in the peanuts.
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8
Spread this mixture over the top of the marshmallows. Using a spatula, work it out until it reaches all corners and crevices of the pan. You may have to mix it up with the now-melting marshmallows to get the gooey goodness to cooperate and become friends with the entire pan. That's perfectly okay!
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9
For the top layer:
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10
Whip together the brownie mix as directed on the package. Fold in peanut butter chips and marshmallow bits.
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11
Spread this beautiful batter on top of the middle layer.
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12
Jiggle the pan a little to get the batter to spread out to all the pan's edges, then place in the oven.
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13
Bake for 40 minutes or until done. Your oven might be more of a flame-thrower than mine, so adjust baking times accordingly!
