Firstly - I have a Betty Crocker super moist white cake mix which is 16.25 oz. Would putting all of the 16.25 oz cake mix in a 9 x 1.5 inch wilton round pan not be a good idea? If it's not a good idea, what is your suggestion? The recipe says it could make two 9-inch rounds. But I'm afraid that the cake will come out thin. That's why I'm thinking of putting all the cake mix in one pan.
Secondly - The recipe calls for 1 1/4 cups water, 1/3 cup vegetable oil, and 3 egg whites. Can I substitute these to 1 1/4 cups milk, 1/3 melted butter, and 4 egg whites? Are these the right amount for substitutions?
Thirdly - I want to bake four layers. Can I mix 4 cake mixes all together at once? If yes, then would I multiply 4 times of the substitution amount?
Fourthly - I want to avoid having a dome so I'm planning to use baking strips (made out of foil and paper towels). Should I bake the cake at 325 using home convection ovens? The instruction calls for 350 for nonstick pan (not sure if its for convection or conventional oven). And how many minutes should I bake it for?
This is a super long post. Sorry! I'm really looking forward to your reply. Thank you! :D