Preheat oven to 400 degrees F. Line a baking sheet with parchment paper or foil.
Add the sliced chicken breasts, peppers, and sliced onion to a large bowl. Or alternatively, you can place it all directly on the baking sheet if you want to save on dishes.
Add the lime juice and olive oil to the mixture and toss until the chicken and veggies are coated. Next add the taco seasoning and give it another toss to evenly distribute among the chicken and veggies.
Spread the mixture in a single layer on a baking sheet. You may need to use two. (You can skip this step if you opted to place the chicken and veggies on the baking sheet right from the start).
Bake for 25-30 minutes, flipping half way through cooking time, or until chicken is cooked through and vegetables are slightly browned and crispy on the edges.
Serve on corn tortillas, rice, or a salad and top with avocado or guacamole, cilantro, salsa, Greek yogurt or sour cream.