Classic Green Bean Casserole

INGREDIENTS

slices of bacon , optional

1/4 cup

finely minced onion , optional

( 10.75 ounce ) can of condensed cream of mushroom soup

1/2 cup

whole milk

1 tsp

low sodium soy sauce

1/4 tsp

freshly ground black pepper , or to taste

4 cups

cooked green beans

1 1/3 cups

(more or less) of French fried onions (like French's), divided