It's interesting because scientists who where studying the effects of eating cooked foods in human evolution did some tests where they fed raw beef to a group of snakes, then fed cooked beef to a second group of snakes.
The ones that ate the cooked food had more energy, took less time to digest food, and where in over all peak of health compared to the ones who ate raw food.
So feeding your snake cooked food (or at least cooked beef) is actually better for them than raw.