In a large skillet, brown beef & break up with spatula. Season with salt & pepper & drain fat well. Set aside. (You might want to consider slightly rinsing the fat off the cooked beef with a little water to prevent an oily soup.)

Combine milk, broth, onion soup mix, garlic powder, basil & cornstarch in a 4-6QT slow cooker. Whisk until cornstarch dissolves.

Add sliced potatoes & cooked ground beef. Stir. Cook on low for 5-6 hours or until potatoes are done.

Heat up the whole can of green beans, liquid & all, in a small saucepan on the stove until boiling. Drain beans & add to the soup. Stir & serve.