Nearly 100 percent of the cost of baking cookies comes from the ingredients used to make the cookie dough. A very small, almost immeasurable part of the cost comes from the energy used to bake the cookies.
It costs around 4 cents to operate an electric oven at 350 degrees Fahrenheit for 30 minutes. Since most cookie recipes call for far less cooking time, only a minuscule amount of the cost of baking cookies comes from the energy used during baking. The bulk of the cookies’ cost comes from the purchase of flour, butter, spices, oil, eggs and other ingredients used to make them.