I am making bars for "Teacher Appreciation Week" at work. And I was wondering if I would need to double a 9x13 recipe for a 15x10 pan or if I could just use the 9x13 recipe? I think that with the height differences I would be okay to just use a 9x13, but I want to be sure before I start baking after work today! Thanks in advanced!
According to my handy-dandy Wilton Servings chart, the batter amount difference between a 9x13" and a 11x15" is 1 1/2 cups (10 cups of batter for the 9x13; 11 1/2 cups of batter for the 11x15"). So using the 9x13"-sized recipe in a larger pan will result in a thinner bar. Maybe scale the recipe up a bit? Doubling it might be too much, so maybe increase it by a third?
Good luck!
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