Add the potatoes, carrots, and onions to the slow cooker. Drizzle the vegetables with 2 tablespoons of olive oil and sprinkle with the Italian seasoning, 1 teaspoon salt, and ½ teaspoon black pepper. Toss to thoroughly coat.
Season the tri tip roast with thyme, rosemary, and remaining salt and pepper. Heat the remaining olive oil in a large cast-iron skillet set over medium-high heat. Sear the roast for 2 minutes on all sides. Place the roast on top of the vegetables in the slow cooker.
Add the minced garlic to the skillet, then pour in ½ cup of broth and scrape the browned bits off the bottom with a wooden spoon. Stir in the remaining broth, as well as the onion soup mix and Worcestershire sauce. Bring to a simmer, then pour the contents of the skillet over the roast in the slow cooker.
Cover and cook the roast on low for 6 to 8 hours or on high for 3 to 4 hours.
Video
Notes
Use chuck roast if you cannot find tri tip.
Sear the tri tip before slow cooking it to lock in all the juices and flavors. It's not mandatory, but it gives a more tender and flavorful result.
Always put the vegetables below the meat in the Crock Pot. That way, while the meat is slow cooking, the veggies will soak up all that flavor.
Scraping the brown bits off the bottom of the skillet adds a crazy amount of flavor to the broth!
Cook the roast on a low temperature for longer to get the most tender tri tip.
Store any leftovers in an airtight container in the fridge for up to 4 days.
This nutrition information is based on the exact products I used in this recipe. Brands and sizes of products could alter exact nutrition and should always be calculated independently.