Step 1

In a large oven safe skillet, brown ground beef, onions, and mushrooms until beef is cooked through and vegetables are tender.

Step 2

Drain excess fat. Add garlic and cook for another minute.

Step 3

Stir in flour and cook for another minute.

Step 4

Whisk in broth, milk, salt, and pepper.

Step 5

Add green beans and cook mixture until thickened.

Step 6

Remove from heat and stir in 1 cup cheese and sour cream.

Step 7

Shred potatoes with a grater or food processor and squeeze out excess liquid.

Step 8

Top casserole with shredded potatoes and remaining 1/2 cup cheese.

Step 9

Bake at 350 degrees for 30 minutes or until potatoes are tender. I like to broil the casserole for another couple of minutes at the end to crisp the top.