Heat the oil in a large skillet over medium-high heat. Pat the beef tips dry with paper towels, then add them in a single layer. Brown in batches, turning occasionally, until you get nice color on at least two sides. Do not overcrowd the pan. Transfer the browned beef tips to the crock pot as you go.
2.5 pounds beef stew meat or sirloin tips, 2 tablespoons olive oil or vegetable oil
In the same skillet, reduce the heat to medium. Add the chopped onion and cook for 3–4 minutes, scraping up any browned bits from the bottom of the pan. When the onion starts to soften, add the minced garlic and cook for 30–60 seconds, just until fragrant. Transfer the onion and garlic to the crock pot.
1 medium yellow onion, 3 cloves garlic
In a medium bowl, whisk together the beef broth, condensed cream of mushroom soup, dry onion soup mix, Worcestershire sauce, dried thyme, paprika, black pepper, and salt until mostly smooth and well combined. The mixture will not be very thick yet.
1.5 cups beef broth, 10.5 ounces condensed cream of mushroom soup, 1 ounce dry onion soup mix, 2 tablespoons Worcestershire sauce, 1 teaspoon dried thyme, 1 teaspoon paprika, 0.5 teaspoon black pepper, 0.25 teaspoon salt
Pour the gravy mixture over the beef tips, onions, and garlic in the slow cooker. Gently stir so the meat is mostly submerged; the liquid will redistribute as it cooks.
Cover the crock pot and cook on LOW for 7–8 hours or on HIGH for 4–5 hours, until the beef is very tender when pierced with a fork. Cooking on LOW gives the best texture, especially for stew meat or chuck.
About 20–30 minutes before serving, whisk the cornstarch and cold water together in a small bowl to make a smooth slurry. Stir the slurry into the crock pot, cover, and continue cooking on HIGH for about 20 minutes, or until the gravy has thickened. For a thinner gravy, add only part of the slurry.
3 tablespoons cornstarch, 3 tablespoons cold water
Taste the gravy and add more salt or pepper if needed. If it tastes too salty, stir in a splash of extra water or broth and, if desired, a tablespoon of heavy cream or sour cream to mellow the flavor.
0.5 teaspoon black pepper, 0.25 teaspoon salt
Serve the tender beef tips and gravy over mashed potatoes, egg noodles, rice, cauliflower mash, or polenta. Garnish with chopped fresh parsley if desired. Serve warm with your favorite vegetables on the side.
fresh parsley, mashed potatoes, egg noodles, rice, cauliflower mash, or polenta