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Break Oreo cookies in a large bowl into small chunks
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Grease 9x9 baking dish with lots of butter
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In microwave safe bowl, melt all marshmallows and 1/4 cup butter together
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In 30 second intervals and stirring in between until smooth
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Quickly add Oreo cookie chunks into marshmallow and combine
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Pour mixture into greased pan and press down with a greased spatula until flat
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The mixture will start to get hard quickly so place your pretzels where you want and lightly press down so they stick into the mixture before it hardens
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Melt down your sea salted chocolate bar in the microwave, slowly so it doesn't burn
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Drizzle over your bars before or after you cut them in squares, either way works