Preheat a skillet to medium heat, then add enough butter (or add a spritz of oil) to cover the skillet.
Place the tortilla in the skillet, then top it with the remaining ingredients, adding salt and pepper if you prefer.
Cook the open tortilla 3-4 minutes. When it has started to brown a bit, fold the other side over the fillings and continue cooking 1-2 more minutes (flipping the tortilla if one side needs to be more browned).
Net carbs are 4.7 g per quesadilla using Mission Carb Balance Tortilla
Serving: 1 quesadilla (using Mission Carb Balance Tortilla for these numbers), Calories: 308kcal, Carbohydrates: 19.7g, Protein: 30g, Fat: 16.8g, Cholesterol: 414mg, Sodium: 490mg, Fiber: 15g, Sugar: 0.4g