Creating breakfast quesadillas is straightforward and enjoyable. Just follow these steps:

1. Prepare your Ingredients: Chop the vegetables, cook the bacon or sausage if using, and beat the eggs in a bowl. Season with salt and pepper.
2. Cook the Eggs: In a skillet, heat the olive oil or butter over medium heat. Pour in the beaten eggs and scramble until fully cooked. Set aside.
3. Sauté the Vegetables: In the same skillet, add a little more oil if necessary, and sauté the diced bell peppers and onions until soft, about 3-4 minutes.
4. Combine Fillings: Add the scrambled eggs into the skillet with the veggies. If you’re using bacon or sausage, toss that in as well. Mix everything together and remove from heat.
5. Assemble the Quesadillas: Place a tortilla in a clean skillet over low heat. Sprinkle a layer of cheese on one half of the tortilla. Add a generous portion of the egg mixture on top of the cheese and then another layer of cheese over the mixture. Fold the tortilla in half.
6. Cook the Quesadilla: Cook for 3-4 minutes on each side, or until golden brown and the cheese has melted. Repeat with the remaining tortillas and filling.
7. Slice and Serve: Once cooked, transfer the quesadillas to a cutting board. Let them cool for a minute, then slice into wedges.