when you add the powder
Put 1/3 of the dry cake mix in a bowl. Add 1/2 the milk and stir to combine. Add 1/2 the remaining cake mix to the bowl, stir to combine. Add remainder of milk to the bowl. Stir to combine. Add remainder of cake mix to bowl. Stir to combine. Cake-milk-cake-milk-cake = three additions, beginning and ending with cake mix. :) Don't overmix your batter, or the cake will be tough.
No
Often you do, yes.
yes
The primary use for eggs is to act as a binding agent. They hold the cake together once it has been baked, so it does not crumble or fall apart too easily. They also add a glossy finish to the cake, make it smooth and moist, and add flavor.
Milk provides three major ingredients to a cake - water, protein and fat. These ingredients add to the cake structure when heated, as their proteins coagulate, making the cake more tender.
Yes. Whenever I make a cake that calls for water, I always replace the water with milk. This makes for a more moist cake. You can add oil, but that can be tricky because you don't want to end up with an oily sheen on your cake. I would start by substituting milk for any water in the recipe, and see if you notice a difference.
To turn the cake batter into a liquid. Why milk specifically? Because the recipe says so. I've definitely replaced milk with juice before and only good things have resulted, so I doubt that what you add really matters on a chemical level.
When a boxed cake mix calls for water only, it usually will have milk in powder form in the mix.
You can add sour cream, which tastes amazing in chocolate cake. Or adding a box of pudding mix and a little bit of milk, just a tablespoon or two.
After slicing and in dish, pour milk over it.
Just substitute 1 egg with 2 to 3 tablespoons of milk=]