I got this recipe a few years ago from a little cookbook at a grocery store checkout lane. This is my modified version. I always eat more of these than I should; they also make good leftovers.
2 cups chicken, cooked and shredded
2 cups (8 oz) Colby Jack cheese, shredded
1 cup Ranch dressing
1 medium tomato, diced and seeded
1/2 - 1 can (4 oz) diced green chiles, rinsed and drained (depends on how much you like)
8 flour tortillas, approximately
Combine chicken, cheese, dressing, tomatoes, and chiles in a medium bowl. Place about 1/2 cup of the chicken mixture on each tortilla, then fold in half. Put quesadillas on a baking sheet. Bake at 350 degrees for 15 minutes or until the cheese is melted. Cut in half or thirds. Serve with salsa and guacamole.