Chicken With Mushrooms And Tomato

"Chicken With Mushrooms And Tomato" from Real Simple
http://www.foodily.com/a/recipe/1171052
http://www.foodily.com/a/recipe/1171052

Ingredients:

• 1 4-oz boneless, skinless chicken breast
• 1/4 tsp kosher salt
• 1/4 tsp black pepper
• 2 tsps olive oil
• 1/4 yellow onion, thinly sliced
• 4 ozs button mushrooms, quartered
• 1 clove garlic, thinly sliced
• 1 medium tomato, diced
• 1/4 cup fresh flat-leaf parsley, chopped
• 1/2 cup cooked brown rice (optional)