Heat a small non-stick skillet over medium heat and cook the chicken sausage until browned and slightly crispy. Remove and set aside.
In a bowl, whisk the egg, egg whites, cottage cheese, scallions, salt, and black pepper.
Lightly spray the skillet and cook the eggs over medium heat, folding gently until set and no moisture remains (about 2–3 minutes). Remove from heat.
Heat a clean skillet or griddle over medium-low heat and lightly spray with oil. Place the tortilla in the pan.
Add half the cheese to one side of the tortilla, then layer the eggs and sausage on top. Sprinkle the remaining cheese over the filling.
Fold the tortilla and cook until golden brown and crispy, about 2–3 minutes per side, until the cheese melts.
Slice and serve your Breakfast Quesadilla Recipe with salsa and guacamole if desired.