Heat 1 tablespoon of olive oil in a skillet over medium-high heat.
Add the chicken slices and cook until no longer pink, about 5-7 minutes.
Add the bell pepper and onion, and cook until softened, about 5 minutes.
Stir in the chili powder and cumin, and cook for another minute.
Remove the mixture from the skillet and set aside.
Wipe the skillet clean and heat the remaining 1 tablespoon of olive oil over medium heat.
Place one tortilla in the skillet, sprinkle with cheese, add the chicken mixture, and top with more cheese and another tortilla.
Cook until the bottom tortilla is golden brown, about 2-3 minutes, then flip and cook the other side until golden brown and the cheese is melted.
Repeat with the remaining tortillas and filling.
Cut into wedges and serve warm.