Chicken Quesadillas

Name: Chicken Quesadillas
Ingredients: 12 large flour tortillas; 2 tablespoons olive oil; 2 1/2 cups grated cheese (Monterey Jack is the best); 2 pounds skinless chicken breasts; Pico de Gallo, for serving, recipe follows; Salt and pepper; 2 tablespoons taco or Cajun seasoning mix; 1 large onion, cut in half and then into slices; 1 green bell pepper, seeded and sliced into strips; 1 red bell pepper, seeded and sliced into strips; 1 yellow bell pepper; 12 tablespoons butter, for frying; 12 Roma tomatoes (slightly under ripe is fine); 3 yellow or red onions; 2 cups fresh cilantro leaves; 2 to 3 jalapenos; 1 lime; Salt