Cut chicken breasts in half horizontally and between saran wrap or in a ziploc bag, pound to approximately ¼" thickness with the smooth side of a meat tenderizer.
In a nonstick pan, over medium heat, heat olive oil and add garlic clove in - heat until garlic clove is sizzling.
Add the slice mushrooms to the pan, along with salt and pepper. Stir, and cover with a lid. Turn the heat down to medium low. Cook the mushrooms for about 8-10 minutes.
Remove lid and add ¼ cup white wine to the mushrooms.
Cover with lid again, and let mushrooms finish cooking, about 4-5 minutes. Remove the garlic clove from the mushrooms. Remove mushrooms from the pan and set aside.
In the same pan, bring heat mack up to medium. Dredge the chicken with flour. Add butter. Let it melt.
Add flour dredged chicken to the pan. Season with salt and pepper. Cook about 4-5 minutes per side.
Add ¼ cup of wine to the chicken. Let the wine reduce, a few minutes.
Add the mushrooms back to the pan, Give everything a good mix, so the flavors combine. Add parsley and mix one more time. Let everything cook together for a few minutes.
Plate, spoon the extra sauce over top, and enjoy your mushroom chicken!