Chicken Thigh Paillard Style

I say style since there are no breadcrumbs. recipe for 2.

11&1/2 oz. boneless chicken thigh,
6 oz. white mushrooms,
1 T. fresh minced garlic,
5&1/2 oz. onion,
2 oz. celery,
1 oz. carrots, flour,
salt and pepper, 1/3 c. light olive oil,
3 T. butter.

My cost $4.35