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Preheat oven to 350 degrees and prepare a 9x13 pan by spraying it with nonstick cooking spray.
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Cream sugar, butter, and eggs until well blended.
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Add vanilla peanut butter, mix well.
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Stir in dry ingredients, including oats.
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Spread into the prepared 9x13 pan and bake for 15 minutes.
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Sprinkle evenly with mini marshmallows and place back in the oven for an additional 5 minutes.
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Cool for 15 minutes then spread with chocolate frosting. (recipe below)