What is the recipe for making Ultimate Fudge brownies in a 9x13 pan if using 2 boxes

Big pan of Ultimate Fudge Brownies? Just double the ingredients for the 13 x 9-inch pan. Since the larger pan is similar in square inches to two of the 8 x 8 inch pans, I would recommend baking at the same temperature and the same time. The depth of the brownie batter is going to be very similar. Check at the minimum bake time but expect to bake for the maximum time. Here are some handy tips for baking brownies.