Preheat oven to 350 degrees
Grease a standard 12-cup muffin tin with cooking spray.
In a large bowl combine half and half, garlic powder, thyme, onion powder, pepper, salt, nutmeg and parmesan.
Toss potatoe slices in mixture making sure that each slice is coated.
Divide/stack potatoes between muffin tin cups. As you create the stack, add a small amount of Gruyere to each layer.
Cover with foil and bake until tender, approximately 40 minutes.
Remove from oven and uncover. Add remaining Gruyere and bacon pieces to each stack.
Place back in oven and bake until cheese is melted, approximately 20 minutes.
Garnish with parsley and let cool in pan for 10 minutes before serving.