Slice the sausages into rounds and cut the onion into thin strips. Sauté both in a skillet with a little oil.

Once the sausages are cooked, heat the tortillas on a griddle or skillet over low heat. Add shredded Oaxaca cheese and the sausage mixture to the center of each tortilla, then fold the tortilla in half to make a quesadilla-style sandwich.

When the cheese has melted, remove from the griddle. Serve hot for breakfast.