Cheesy Meatballs & Shells Casserole

INGREDIENTS

2 cups

medium shells, uncooked

lbs small cooked meatballs (see NOTES)

1 cup

process cheese (like Velveeta) cubed

1/2

sleeve buttery crackers, crushed (like Ritz)

1 tbsp

butter, melted

Sauce:

1/4 cup

flour

2 tbsp

butter

2 cups

rich beef stock (see NOTES)

1 can

cream of mushroom soup (I use reduced sodium)