Prep your fillings: Finely dice your veggies so they cook quickly. Grate your cheese if not pre-shredded. If using pre-cooked meats like turkey bacon, chop them into small pieces.

Cook the veggies: Heat a nonstick skillet over medium with 1 teaspoon oil. Add peppers, onions, or mushrooms. Cook 3–4 minutes, stirring, until softened. Add spinach last and wilt for 30 seconds. Transfer to a bowl.

Scramble the egg whites: Wipe the skillet lightly. Add a small drizzle of oil. Pour in egg whites. Season with salt, pepper, and a pinch of garlic powder. Stir gently with a spatula for 1–2 minutes until just set and still a bit glossy. Remove from heat so they don’t dry out.

Assemble the quesadilla: Place your tortilla on a plate or cutting board. Sprinkle half the cheese over one half of the tortilla. Spoon the egg whites and cooked veggies over the cheese. Add cilantro or green onions if using. Finish with the remaining cheese on top.

Fold and cook: Fold the empty half of the tortilla over the filling to make a half-moon. Return the skillet to medium heat with a light brush of oil. Cook the quesadilla 2–3 minutes per side, pressing gently with a spatula, until golden and crisp and the cheese is melted.

Rest and slice: Transfer to a cutting board and let it rest 1 minute to set the cheese. Slice into wedges.

Serve: Add salsa, hot sauce, and a dollop of Greek yogurt if you like. A few avocado slices make it extra satisfying.