Grilled Chicken Quesadillas

Name: Grilled Chicken Quesadillas
Prep time: 10 min
Total time: 10 min
Cuisine: Mexican, Latin American, American
Ingredients: Vegetable oil, for brushing; 1 small white onion, sliced into rounds; 2 medium red bell peppers, sliced into rounds; Kosher salt; Freshly ground pepper; 2 (8-oz.) chicken breasts; 1/2 tsp. chili powder; 1/2 tsp. ground cumin; 1/2 tsp. dried oregano; 8 medium flour tortillas; 3 c. shredded Monterey Jack; 3 c. shredded cheddar; 2 green onions, thinly sliced; Guacamole, for serving; Sour cream, for serving