Sear the cubed steaks first. Use garlic powder, onion powder, paprika, pepper and salt. (YOU DO NOT HAVE TO DO THIS STEP. YOU CAN ADD THE CUBED STEAK DIRECTLY TO THE CROCKPOT). I'll try it both ways, but I did sear the steak this time.

In a skillet, add:

One Pkg. Dry Soup/Onion Dip Mix 
One Can Cream of Celery (or Cream of Chicken, Cream of Mushroom)
One Can Rotel - I used mild (substitute diced tomatoes instead if you don't like green chiles)
One Pkg. of Brown Gravy Mix
One Can Beef Broth (can use chicken broth if that's all you have)

Add one large chopped onion to bottom of crockpot. Put cubed steak on top of onion. Pour the mixture above over the cubed steak. Cook on Low 6-8 hours or on High for 3-4 hours.

Note: You can also use Au Jus mix instead of brown gravy mix.