Heat the olive oil in a skillet over medium-high heat.
Add the red bell pepper, onion, and jalapeno pepper to the skillet and cook, stirring often, until the vegetables are tender, about 5 minutes.
Remove the vegetables from the skillet and set aside.
Place two of the tortillas on a work surface. Divide the cheese, cooked vegetables, and salt and pepper evenly between the two tortillas.
Top each tortilla with the remaining two tortillas.
Heat a skillet over medium-high heat. Place the quesadillas in the skillet and cook, turning once, until the cheese is melted and the tortillas are golden brown, about 5 minutes per side.
Remove the quesadillas from the skillet and cut into wedges.
Serve with sour cream and salsa, if desired.
Interesting Facts
Quesadillas originated in Mexico and are a popular Mexican dish.
Quesadillas can be filled with a variety of ingredients, including beef, chicken, beans, cheese, and vegetables.
Quesadillas are often served with salsa, guacamole, sour cream, or other toppings.