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Preheat oven to 350 degrees F.
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Grease and flour a 9x13 inch baking pan.
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Empty jar of brownie mix into large bowl and stir to blend all ingredients.
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Add melted butter and eggs.
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Mix until all is moistened and combined.
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Spread batter evenly into prepared baking pan.
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Bake for 25 to 30 minutes in preheated oven.
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Cool completely in pan.
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Cut and serve!