Chicken Enchiladas

Name: Chicken Enchiladas
Ingredients: 16 whole Corn Tortillas; 2 whole Boneless, Skinless Chicken Breasts; Cumin, For Sprinkling; Chili Powder, For Sprinkling; 1/4 cup Vegetable Oil; 1 whole Large Onion, Diced; 3 cans (15 Ounces Each) Green Enchilada Sauce (or Use Red If Preferred!); 3 cups Grated Cheddar/Jack Cheese, More If Needed; Sour Cream, For Serving; Diced Tomato, For Serving; Chopped Cilantro, For Serving