Ground Beef Cheesy Stuffed Mushrooms

Mushrooms stuffed with ground beef, sautéed onions, garlic, parsley and parmesan cheese.
For recipe:
https://www.foodbakies.com/ground-beef-stuffed-mushrooms/
Ingredients
1.5 pounds (24 OZ) Mushrooms
1 cups Ground beef
2/3 cup Chopped onions
2 large gloves Minced garlic
1/3 cup Chopped Parsley
1/2 cube Beef Bouillon cube
1/2 cup Shredded parmesan
1/2 tsp Salt
pinch Black Pepper
2 tsp Oil
3-4 tsp Melted butter