Bang out your chicken to make it all one thickness using a rolling pin or meat tenderiser. This helps it cook quicker!
Season chicken with pepper and salt.
Add flour to a flat dinner plate and coat chicken breasts in the flour.
Using a frypan on medium heat, add a tablespoon of butter.
Fry chicken breast for around 5-6 minutes on each side. Chicken doesn't have to be cooked through as you will add it back to the pan to cook in the sauce.
Remove chicken breast and set it aside.
Without cleaning the frypan, add a tablespoon of butter along with mushrooms. Fry off the mushrooms for around 5 minutes or until browned.
Add garlic and fry for a further minute. Add wine and allow it to cook for 1 minute.
Add garlic and onion powder, salt and pepper.
Add cream, stock and mustard.
Add chicken back to the frypan and allow to simmer in sauce with the lid on the frypan for 8-10 min.
Top with shallots or parsley and serve over mashed potatoes, rice or pasta.