I’ve got a couple boxes of the Duncan Hines chewy fudge brownies mix.
I thought I saw those double-up type instructions somewhere but there’s nothing on the box.
Also, would adding semi-sweet chocolate chips work well?
Apparently you can bake one box in an 8-inch square, 9-inch square, or 9x13 pan. The latter is 117 square inches, almost as big as two 8-inch pans, so it would probably work for a double batch, though it would have to cook longer.
I wouldn’t also add chocolate chips, seems like asking for trouble.