Heat the skillet by adding a tablespoon of olive oil or butter over medium heat for about 1-2 minutes until shimmering.

In a bowl, beat the eggs, then pour them into the skillet, stirring continuously for 3-4 minutes until softly scrambled.

Lay a tortilla flat, sprinkle cheddar cheese, add scrambled eggs, and any optional vegetables. Fold the tortilla in half.

Cook the quesadilla in the skillet for 2-3 minutes per side until golden brown and crispy.

Transfer to a cutting board, let rest for about 1 minute, then slice into wedges for serving.

Serve with salsa, avocado, or sour cream for added flavor.