I am making a one-layer sheet cake and am not sure how many mixes to use. I want it to be thick like the ones in the grocery stores. Thanks
It will take about 1 1/2 mixes. I would make two mixes and fill the pan about 3/4 full and use the rest for cupcakes.
The cake extender recipe will give you the exact amount you'll need for a 9x13. You use a Duncan Hines cake mix, add 1 cup flour, 1 cup sugar, 3/4 tsp. salt. Add the water, oil, and eggs according to the box. Then add another whole egg, 1 tsp. almond extract, 1 tsp. vanilla extract, 8 oz. container of sour cream. Check the recipe section...I don't think I missed anything.
i use two mixes for a 9x13 and 3 for a 12x18. thats just straight mix with pudding added (the sugar free, so its not even a lot)