Heat olive oil in a large skillet over medium-high heat.
Add chicken strips, chili powder, cumin, garlic powder, onion powder, salt, and pepper. Cook until chicken is browned and cooked through, about 5-7 minutes. Remove chicken from skillet and set aside
Add bell pepper and onion to the same skillet. Cook until softened, about 5-7 minutes.
Return chicken to the skillet with the vegetables.
Wipe out the skillet or use a separate griddle. Place one tortilla in the skillet. Sprinkle half of the tortilla with 1/4 cup of cheese. Top with about 1/4 of the chicken and vegetable mixture. Sprinkle another 1/4 cup of cheese over the filling.
Fold the tortilla in half to create a quesadilla.
Cook until golden brown and cheese is melted, about 2-3 minutes per side.
Repeat with remaining tortillas and filling.
Cut each quesadilla into wedges and serve immediately with your favorite toppings.
Notes
You can use pre-cooked rotisserie chicken for an even quicker meal.
Feel free to add other vegetables like mushrooms or jalapeños.
Adjust the spice level by adding more or less chili powder.