Preheat the oven to 400F and line a 9 X 13 baking dish with parchment paper.
Add in the sliced bell peppers, chopped garlic and the sliced onions.
Top the peppers and onions with the sliced chicken breasts.
Combine all of the seasonings in a small bowl. Sprinkle the seasonings over the surface of the chicken, peppers, and onion.
Drizzle the chicken, peppers, and onion with olive oil.
Bake in the preheated oven for 45 minutes, tossing every 10 minutes or so to ensure evenly cooking and browning.
Serve with tortillas, shredded cheese, sour cream, and toppings of your choice. Avocado, shredded lettuce, diced tomato, and guacamole all make excellent toppings if you have them on hand.