Combine cheeses in a small bowl. Set aside.

Heat olive oil in a medium saute pan over medium-low heat. Add onion and saute for 2 minutes. Add corn and pepper; saute for 1 minute. Add chicken and saute for 1 minute. Remove from heat, then stir in cilantro.

Divide cheese mixture and spread over 2 tortillas. Layer each tortilla with half the chicken mixture and top with remaining tortillas.

Spray a large frying pan or griddle with cooking spray. Warm quesadillas over medium heat for 5 to 6 minutes, flipping halfway.