In a medium-size bowl, beat the eggs. Set aside 1 tablespoon (15ml) of beaten eggs in a small bowl for the tops of the soufflés. Add about a third of the sauce mixture into the medium bowl of eggs and whisk until combined. Add the egg mixture back into the saucepan and whisk until smooth. Stir in the Colby-Jack cheese, half of the parmesan cheese and spinach.