Mix both boxes according to directions, and combine the batter. You can use a large mixing bowl and combine both boxes of mix together and add the other ingredients all at once. If you have only boxes of Jiffy Mix, use a brownie sized baking pan, 8x8, if you are using a box of regular cake mix, use a 9x13 pan. Spray pan with cooking spray. Bake at 350 degrees until done, approx. 30 minutes. Test for doneness- insert a toothpick, it should come out clean.
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