Chicken Fajitas Quesadillas

Name: Chicken Fajitas Quesadillas
Ingredients: FAJITA SEASONING:; 1 Tbsp chili powder; 1/2 Tbsp paprika; 1/2 tsp onion powder; 1/4 tsp garlic powder; 1/4 tsp cumin; 1/8 tsp cayenne pepper; 1 tsp sugar; 1/2 tsp salt; 1/2 Tbsp corn starch; QUESADILLAS:; 2 small yellow onion (sliced); 1 medium green bell peppers (sliced); 1 medium red bell pepper (sliced); 1 lb chicken breasts sliced into strips; 2 Tbsp vegetable oil; 1 cup shredded Mexican blend cheese; 8 large flour tortillas (burrito size)