Green Bean Casserole Parisienne

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3 cups sliced, fresh green beans

1/2 lemon, thinly sliced

4 tablespoons unsalted butter

2 cloves garlic, minced

1/2 cup diced onion

3/4 cup sliced mushrooms

1 (10.75 oz.) can condensed cream of mushroom soup

1/2 teaspoon dried thyme

1/2 teaspoon black pepper

pinch kosher salt

3/4 cup French's Fried Onions

1 cup grated white cheddar or Gruyere cheese