Tex-Mex Squash Chicken Casserole

1 10-ounce packages frozen chopped spinach, thawed
3 medium yellow squash, thinly sliced
1 small yellow onion, thinly sliced 
1 large red bell pepper, cut into 1/2" pieces
2 tablespoon olive oil
3 cups shredded cooked chicken or turkey
12 6-inch corn tortillas, cut into 1" pieces
1 10.75 ounce can of cream of celery soup, undiluted
1 8-ounce container sour cream
1 8-ounce jar picante sauce
1 4.5-ounce can of chopped green chiles, undrained
1 1.4-ounce envelope fajita seasoning **
2 cups shredded sharp cheddar cheese, divided
Drain spinach well, pressing between paper towels; set aside.

Sauté squash, bell pepper, and onion in hot oil in a large skillet over medium-high heat 6 minutes or until tender.  Remove from heat.

Stir in spinach, chicken, next 6 ingredients, and 1-1/2 cups cheese.  Spoon into a lightly greased 13- x - 9-inch baking dish.

Bake at 350 degrees for 30 minutes.  Sprinkle with remaining 1/2 cup cheese, and bake 5 more minutes. 

Serves 8 people.

** Fajita Seasoning

2 teaspoon chile powder
1 teaspoon salt
1 teaspoon paprika
1 teaspoon sugar
3/4 teaspoon crushed chicken bouillon cube
1/2  teaspoon  onion powder
1/2 teaspoon garlic powder
1/4 teaspoon cumin