Take a large, deep pot, and fill it halfway with water. Drop whatever chicken you want to cook into the pot, and boil it until done. (It sounds odd, but I learned this trick from a butcher.)This is the bulk of the prep work.
Take the boiled chicken breasts out, and put them into a large frying pan. Add 2-3 cups of water. Add the onion powder, garlic powder, and crushed red pepper flakes. Add 2-3 cups of soy sauce.
Turn the stove on to high, and let simmer for about 40 min, turning and adding water as necessary. (The key is to put enough soy sauce in that when the sauce boils down, you can add water without risk of weakening the flavor.)