Heat oven to 400° F. Rinse the chicken and pat dry with paper towels. Season the chicken with 1/8 teaspoon of the salt and 1/8 teaspoon of the pepper. Heat the oil in a medium ovenproof skillet over medium-high heat. Cook the chicken until browned, 2 to 3 minutes per side. Transfer to a plate. Add the onions and mushrooms to skillet and cook, stirring occasionally, for 5 minutes. Add the garlic, tomato, parsley, and the remaining salt and pepper. Cook for 2 minutes. Return the chicken to skillet and transfer to oven. Roast until the chicken is cooked through, 8 to 10 minutes. Serve with brown rice (if using).
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