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Preheat oven to 350 degrees.
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Line a 9x13 baking pan with foil and spray well with non stick cooking spray. Leave some overhang so you can remove brownies from the pan after baking.
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In a small saucepan, melt butter and chocolate chips together over low heat and set aside to cool.
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Once cooled, transfer chocolate and butter mixture to a large mixing bowl and add sugar, stirring well.
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Then add eggs and vanilla and continue stirring until completely combined.
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Stir in flour, cocoa powder and salt.
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Spread batter evenly in baking dish and gently press peanut butter cups into brownie batter.
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Bake about 30 minutes.
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Let brownies cool, remove brownies from pan using foil edges and cut into squares.