Step 1: Sear the Beef Tips: Heat olive oil in a large skillet over medium-high heat. Sear the beef tips in batches until browned on all sides. This step adds flavor and helps to seal in the juices. Remove the beef from the skillet and set aside.
Step 2: Saut Aromatics: Add the chopped onion and minced garlic to the same skillet and saut until softened and fragrant, about 5 minutes. Stir in the sliced mushrooms and cook until they release their moisture and begin to brown, about 5 more minutes.
Step 3: Make the Gravy Base: Sprinkle the flour over the vegetables in the skillet and cook for 1-2 minutes, stirring constantly, to create a roux. Gradually whisk in the beef broth and red wine (if using), ensuring no lumps form. Stir in the Worcestershire sauce, thyme, rosemary, salt, and pepper. Bring to a simmer.
Step 4: Combine and Slow Cook: Transfer the seared beef tips to the crock pot. Pour the gravy mixture over the beef. Add the bay leaf. Cover the crock pot and cook on low for 6-8 hours, or on high for 3-4 hours, until the beef is tender.
Step 5: Thicken the Gravy (Optional): If the gravy is too thin, remove the bay leaf and stir in a slurry made from 1 tablespoon of cornstarch mixed with 2 tablespoons of cold water. Cook on high for 15-20 minutes, or until the gravy has thickened to your desired consistency.
Step 6: Serve and Enjoy: Serve the beef tips and gravy over mashed potatoes, rice, or egg noodles. Garnish with fresh parsley, if desired.
Optional Tip: For a richer flavor, use bone-in beef short ribs in place of beef tips. Reduce the amount of salt added, as the short ribs will naturally release salt during cooking.