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Preheat oven to 350F/177C. Grease and line six 8-inch round pans. Set aside.
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In a bowl, stir butter, eggs, Fudge Brownie Mix until well blended.
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Fold in ½ cup of white chocolate chips. Divide the batter in three pans. Top with the remaining half of white chocolate chips and lightly press to embed in the batter mixture.
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Repeat steps 2 and 3 with the Butterscotch Brownie Mix.
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Bake brownies for 20-25 minutes or until baked. Loosen from the pans and let the brownies cool.
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In a cake stand, flat plate or cake board place a small amount of marshmallow fluff in the middle to make the first layer of brownie stable and stick to the stand.
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Layer Chocolate Fudge Brownies and Butterscotch Brownies alternately with a filling of prepared marshmallow fluff.
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Serve.