INGREDIENTS
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1 (19.8 ounce) package brownie mix
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1/2 cup vegetable oil
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1/4 cup water
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2 eggs
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1 (10.5 ounce) package miniature marshmallows
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2 cups semisweet chocolate chips
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1 cup peanut butter
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1 tablespoon butter
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1 1/2 cups crispy rice cereal