Prep the filling: If your chicken is plain, toss it with a pinch of salt, pepper, and chili powder or smoked paprika. Set aside.
Cook the veggies (optional): Heat a nonstick skillet over medium heat with a small drizzle of oil.
Sauté onion and peppers for 2–3 minutes until softened. Remove to a plate.
Scramble the eggs: Beat the eggs with a pinch of salt and pepper. Add a touch more oil to the skillet and scramble just until softly set.
Don’t overcook. Transfer to the same plate as the veggies.
Assemble in the pan: Reduce heat to medium-low. Add a thin layer of oil or butter.
Place the tortilla in the skillet. Sprinkle half the cheese over one half of the tortilla.
Add the protein: Layer on the chicken, scrambled eggs, and any cooked veggies. Top with the remaining cheese.
Fold the tortilla over to create a half-moon.
Crisp and melt: Cook 2–3 minutes per side, pressing gently with a spatula, until the tortilla is golden and the cheese is melted. Adjust heat to avoid burning.
Finish and serve: Let it rest 1 minute on a cutting board to set. Slice into wedges.
Serve with salsa, hot sauce, and a dollop of Greek yogurt. Garnish with cilantro or green onion if you like.