Add water, beef, and onions to crockpot and cook on HIGH for 4 hours. Then add crushed up boullion cubes and mushroom soup and let heat through (about an hour). Add egg noodles and the sour cream about a half an hour – 45 minutes before serving, allowing the noodles to cook until tender.
Variation: Use ground beef. Fry the hamburger and onions in a pot, then transfer to crockpot and turn to HIGH. Add the rest of the ingredients except for the sour cream and noodles. Heat through. Add egg noodles and sour cream about a half an hour before serving, allowing the noodles to cook until tender. Before adding the noodles, make sure there is enough water. You can tell by stirring the noodles into the mix, making sure they are sufficiently covered with mix and water. If you add water, add it hot so it won’t slow down your cooking process.