Prep the Eggs: Crack the eggs into a bowl, season with a pinch of salt and pepper, and beat them until well combined.
Scramble the Eggs: In a non-stick skillet, melt the butter (or heat the cooking oil) over medium heat. Pour the beaten eggs into the skillet and cook, stirring occasionally, until they are scrambled and just set. Remove from heat.
Prepare the Tortillas: Lay out the flour tortillas on a clean surface or plate.
Add Cheese: Sprinkle a portion of shredded cheddar cheese evenly on one half of each tortilla, leaving a small border around the edges.
Layer with Eggs: Spoon the scrambled eggs on top of the cheese.
Customize with Toppings: If desired, add your choice of optional toppings, such as diced bell peppers, onions, tomatoes, or cooked bacon.
Fold and Cook: Fold the other half of each tortilla over the filling, creating a half-moon shape.
Heat and Brown: Heat a clean skillet or griddle over medium heat. Place the quesadillas on the skillet and cook for about 2-3 minutes on each side, or until they are golden brown and the cheese has melted.
Slice and Serve: Remove from heat and let them cool for a minute before slicing them into wedges.
Serve: Serve your Egg and Cheese Quesadillas with optional sides like salsa or sour cream.