Mushroom Potatoes with Creamy Parmesan and Garlic Sauce

lbs baby potatoes (or larger yellow/red potatoes cut into about 1 – 1½ inch pieces)

medium onion

mushrooms (, sliced)

white wine (Chardonnay *optional)

garlic (pressed/minced)

heavy whipping cream

parmesan cheese, grated (use more if desired)

Salt

Pepper

chopped fresh flat-leaved parsley