Green Bean Casserole Recipe (with no canned soup)

french-cut frozen green beans, cooked according to the package and drained very well

slices center cut bacon, cut into 1/2-inch or smaller pieces

mushrooms, finely chopped

medium yellow onion, finely diced

butter

large or 2 small cloves garlic, minced

all-purpose flour

and 1/2 cups whole milk

fresh thyme leaves, roughly chopped

(or more to taste) freshly ground pepper

shredded sharp white cheddar cheese

french fried onions