Sharon, for that one, it's a question of square inches. The height of the side walls of the pans are the same, which is important. an 8 x 8" pan is 64 square inches; a 9 x 13 pan is 117. If you double the 8" x 8" recipe, there's only a difference of 11 square inches between the two; I can tell you from experience (and if you compare amounts in some of our published recipes) that doubling an 8" square recipe works just fine in a 9" x 13" pan. It may be a tiny bit thicker, but we've never had any trouble. Susan

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