Preheat the oven to 350°F. Season the chicken with garlic, sofrito, adobo, sazón, black pepper, and oregano, then toss the potatoes and carrots in the leftover marinade.
Arrange the chicken, potatoes, and carrots in a baking dish and bake for 30 minutes. Flip the chicken and bake for another 30 minutes.
Mix water and tomato sauce in the same bowl to pick up any leftover seasoning, then pour it over the chicken and vegetables.
Bake for another 30 minutes, or until the chicken is tender, the vegetables are cooked through, and the sauce has thickened. Serve and enjoy!