In a large nonstick skillet, cook the turkey, onion and garlic over medium heat until meat is no longer pink; drain. Add zucchini, salsa, corn, red pepper and chilies. Reduce heat; cover and simmer until vegetables are tender. Stir in seasonings.
For each quesadilla, place one tortilla in an ungreased nonstick skillet. Sprinkle with 1/4 cup cheese. Top with 1/2 cup filling, then sprinkle with another 1/4 cup cheese. Cover with another tortilla. Cook over medium heat, carefully turning once, until lightly browned on both sides and cheese begins to melt. Cut into eight wedges.