Creamy Garlic Parmesan Chicken and Mushrooms

extra virgin olive oil

small chicken breasts (or 2-3 chicken breasts, trimmed to be around 6 oz apiece)

salt and pepper (to taste (about a pinch each))

cremini mushrooms (cleaned and stems removed (optional, slice into thick slices))

butter

chicken stock

minced garlic

italian herb seasoning blend

grated parmesan cheese

parsley or green onions (to garnish)