Homemade Green Bean Casserole

INGREDIENTS

1 lb

Fresh Green Beans ((ends snapped off))

8 tbsp

Salted Butter ((divided))

1

Large Onion ((chopped))

8 oz

Sliced Mushrooms

3 cloves

Garlic ((minced))

2 1/2 cups

Half n Half

1 tsp

Salt

1 tsp

Pepper

2 tbsp

Flour or Cornstarch

2 cups

Fried Onions ((such as French's))

1/2 cup

Parmesan Cheese, grated ((optional))