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Tender herb-crusted slow cooker roast beef sliced on a white plate, garnished with fresh rosemary and drizzled with juices

Slow Cooker Roast Beef

This slow cooker roast beef is the ultimate comfort food—perfectly tender, juicy, and packed with flavorful garlic butter and herbs. With minimal prep and a trusty slow cooker, you’ll create a melt-in-your-mouth dish that is sure to impress. Try this easy slow cooker beef roast for a no-fuss dinner!
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Prep Time 15 minutes
Cook Time 8 hours
Resting Time 10 minutes
Total Time 8 hours 25 minutes
Servings: 6 servings
Course: Main Course
Cuisine: American
Calories: 350
Ingredients Equipment Method Notes

Ingredients
  

  • 3 onions quartered and placed at the bottom of the slow cooker to work as a flavor-packed base
  • 1 beef bottom round roast 3-4 pounds, a budget-friendly, lean cut that cooks tender in the slow cooker
  • 1/4 cup butter softened, creates that rich, buttery coating on the beef
  • 2 garlic cloves pressed or minced finely
  • 2 teaspoons fresh rosemary chopped, adds a fragrant, savory punch
  • 1 teaspoon dried oregano balances the garlic and rosemary
  • 1 teaspoon salt brings out all the flavors
  • 1 teaspoon freshly ground black pepper for a little kick and aroma
  • 1 teaspoon dried thyme leaves enhances the beef’s natural richness

Equipment

  • Slow cooker (6-quart capacity)

Method
 

  1. Mix the garlic butter rub: Combine the softened butter, pressed garlic, rosemary, oregano, salt, pepper, and thyme in a small bowl. Stir until it forms a fragrant paste.
  2. Prepare the roast: Pat the beef roast dry with paper towels to help the butter rub stick. Then, slather the garlic butter mixture all over the roast, making sure to coat all sides evenly.
  3. Layer the onions: Quarter the onions, remove the skins, and place them at the bottom of your slow cooker. These will infuse the beef with flavor as well as act as a natural roasting rack.
  4. Set up the roast: Place the seasoned beef roast on top of the onions, fatty side down. Don’t add any liquid—the beef will release its own juices as it cooks.
  5. Cook the roast: Cover the slow cooker with the lid and set it to low for 6-8 hours or high for 4-6 hours. Low and slow is my favorite way—it makes the beef so incredibly tender.
  6. Slice and serve: Once the cooking time is up, carefully remove the roast from the slow cooker. Let it rest for a few minutes before thinly slicing it against the grain. Serve with the onions and spoon the juices over the top for extra flavor.

Notes

No liquid is needed—the beef cooks in its own juices for maximum flavor and tenderness. For a complete meal, add veggies like carrots or potatoes around the roast before cooking. To store leftovers, divide into meal-sized portions and refrigerate for up to 4 days or freeze for up to a month.