Spray, butter or oil the crockpot insert
In a separate bowl or canister mix the canned soup, broth and sauce; set aside
Sprinkle each steak with garlic powder, salt & pepper (as desired)
Layer each ingredient in the following order in a single layer each: steaks, onions, mushrooms. Repeat as needed to make sure the steaks are in a single layer (don't stack or supper's an epic fail, trust me)
Sprinkle on the onion soup mix then cover and cook on low for 5 to 7 hours
Serve over rice, pasta or potatoes and enjoy :)