Arrange the beef tips over the mushroom layer in an even layer so they cook consistently. Sprinkle the dry onion soup mix evenly over the beef, distributing it as evenly as possible across all the pieces.
Step 3: Add the Soup
Spoon the undiluted condensed cream of mushroom soup evenly over the top of the beef and onion mix. Do not stir — the layered approach allows each component to contribute its flavors gradually during the long cook rather than everything mixing at once from the beginning. The soup will melt down and merge with the juices released by the beef and mushrooms to form the gravy.
Step 4: Cook Low and Slow
Cover the slow cooker and cook on LOW for 7 to 8 hours, or on HIGH for 4 to 5 hours. The LOW setting is strongly preferred for this recipe — the extended, gentle heat produces noticeably more tender beef and a richer, more developed gravy than the faster HIGH setting. If you are home during the cook, avoid lifting the lid; each time the lid is removed, significant heat escapes and extends the cooking time. The dish is done when the beef is fork-tender and pulls apart easily.
Step 5: Stir and Serve
When the cooking time is complete, gently stir the contents of the slow cooker to combine the mushrooms, beef, and gravy into a unified sauce. The mushrooms will have cooked down almost completely and will be incorporated throughout the gravy. Taste and adjust seasoning if needed — the dish is typically well-seasoned from the onion soup mix and condensed soup, but a small amount of black pepper or garlic powder can be added at this stage if desired. Serve immediately over mashed potatoes, egg noodles, or white rice, with the gravy spooned generously over everything.
