Just for the fun of it, I read the back of a cake mix box and tried to put a mix together. This came in handy when celiac entered my life and I could use gluten free flour. This mix is great for cake but also anywhere a cake mix is used - like this Peach Cobbler.

1 tsp salt
8 g = 1 tbsp corn starch
12 g = 1 tbsp baking powder
18 g = 2 tbsp milk powder
220 g = 1 1/2 C flour (or gluten free flour)
150 g sugar

If you are actually turning it into a cake, add:
1 tbsp corn syrup
1 tsp vanilla
3 eggs
1/2 C oil
1 C water

For chocolate cake, replace 1/4 C flour with 1/3 C cocoa.