How to Make It
In a large skillet, cook the sausage over moderately high heat, stirring to break it up, until no trace of pink remains, about 8 to 10 minutes. Remove the sausage from the skillet and set it aside.
In a separate large skillet, heat 2 tablespoons of vegetable oil over moderate heat, then pour the eggs into the skillet and cook, stirring gently with a rubber spatula, until small curds form, about 5 to 7 minutes. Remove the eggs from the skillet and season with salt and pepper.
Arrange the tortillas on a work surface and top each with sausage, egg and cheese. Fold each tortilla in half to make 8 quesadillas.
In a large skillet, heat 2 tablespoons of vegetable oil. Add the quesadillas and cook over moderately high heat until golden and crisp, about 1 to 2 minutes per side. Add more oil to the pan if necessary. Transfer the quesadillas to a cutting board and cut into 3 wedges. Serve immediately.