Chicken and Peppers: Preheat the oven to 425 degrees. Pat chicken dry with paper towels. Arrange chicken and peppers on a baking sheet. Toss with olive oil and sprinkle with salt and pepper. Roast for 30 minutes or until chicken is cooked through. Sauce: While the chicken and peppers bake, heat olive oil in a skillet. Add onion, garlic, chipotles, and spices. Saute for about 10 minutes. Add tomatoes and salt. Simmer for another 10 minutes. Transfer to a blender and blend until smooth. Finish: Remove sheet pan from the oven. Shred chicken. Toss with the sauce (some, most, all... up to you). Serve chicken and peppers with quinoa, rice, cauliflower rice, beans, tortillas, greens, or just on its own!