Heat the oil in a medium skillet over medium heat. Fry the tortilla one at a time, about 2 minutes per side or until crispy. Drain on a paper-towel lined sheet tray.
Heat 2 tablespoons olive oil in a large skillet over medium-high heat. Add the onions and cook for 3 minutes. Add the sausage and cook until sausage is heated through.
Place tostada shells on serving plates. Top with sausage mixture, eggs, cheese, salsa, and cilantro.
Substitute 1 package Jimmy Dean(R) Hot Pork Sausage Roll for the crumbles. Cook the sausage and onion in a large skillet over medium-high heat 8 to 10 minutes or until sausage is thoroughly cooked, stirring frequently; drain and proceed with the recipe as written.