The eggs in this recipe cook like a fried egg. If you don't like a fried egg, you can scramble the eggs instead. After the sausage is cooked, beat an egg with a tablespoon of milk and some salt, and cook it in a pan. Add the scrambled egg to the quesadilla. In this case, you might need to flip your quesadilla a little sooner because you only need to wait until the tortilla is crisp. You don't have to worry about making sure the egg is cooked through, since it already will be.