Slow Cooker Garlic Onion Beef Roast

Description
This Slow Cooker Garlic Onion Beef Roast is tender, juicy, and packed with comforting savory flavor. A beef chuck roast cooks slowly with fresh garlic, sliced onions, herbs, beef broth, and a rich gravy mixture until it becomes fall-apart tender. The onions soften and caramelize into the cooking liquid, while the garlic adds deep, aromatic flavor without overpowering the beef. It is an easy, satisfying dinner that requires only a few minutes of preparation, making it perfect for busy weekdays, relaxed Sunday dinners, or family gatherings. Serve the roast with mashed potatoes, roasted vegetables, rice, or warm bread to soak up the delicious onion gravy.
Servings: 6–8
Prep Time: 15 minutes
Cook Time: 8–9 hours on Low or 4–5 hours on High
Ingredients
For the Beef Roast

• 3–4 lb beef chuck roast
• 1½ teaspoons salt
• 1 teaspoon black pepper
• 1 teaspoon garlic powder
• 1 teaspoon onion powder
• 1 teaspoon smoked paprika
• 2 tablespoons olive oil
• 2 large yellow onions, thickly sliced
• 6 garlic cloves, minced
• 2 cups beef broth
• 1 tablespoon Worcestershire sauce
• 1 tablespoon tomato paste
• 1 teaspoon dried thyme
• 1 teaspoon dried rosemary
• 2 bay leaves
  For the Gravy
• 3 tablespoons cornstarch
• 3 tablespoons cold water
• Salt and black pepper, as needed
  Instructions

1. Pat the beef roast dry with paper towels. Season all sides evenly with salt, black pepper, garlic powder, onion powder, and smoked paprika.
2. Heat the olive oil in a large skillet over medium-high heat. Add the seasoned beef roast and sear it for 3–4 minutes per side, until a deep brown crust forms. Searing is optional, but it gives the finished roast a richer flavor.
3. Place half of the sliced onions in the bottom of the slow cooker. Set the seared beef roast on top of the onions, then arrange the remaining onions around and over the beef.
4. Add the minced garlic to the slow cooker. In a bowl or measuring jug, whisk together the beef broth, Worcestershire sauce, tomato paste, thyme, and rosemary. Pour the mixture over the roast. Add the bay leaves.
5. Cover and cook on Low for 8–9 hours or on High for 4–5 hours. The roast is ready when it can easily be pulled apart with a fork. Chuck roast becomes more tender when cooked slowly, so avoid removing it before it is fully soft.
6. Carefully transfer the cooked roast to a serving platter and cover it loosely with foil. Remove and discard the bay leaves.
7. To prepare the gravy, pour the cooking liquid and onions into a saucepan, or leave them in the slow cooker and switch it to High. Mix the cornstarch and cold water until completely smooth. Slowly stir the slurry into the hot cooking liquid.
8. Cook for 5–10 minutes, stirring occasionally, until the gravy thickens. Taste and adjust the salt and black pepper as needed.
9. Slice or shred the beef roast and spoon the garlic onion gravy generously over the top. Garnish with chopped parsley if desired and serve hot.
   Tips and Notes
   Choose a chuck roast with visible marbling because the fat melts during slow cooking and keeps the meat moist. Avoid using a very lean roast, as it may become dry. Cut the onions into thick slices so they do not completely disappear during the long cooking time. For extra flavor, add sliced mushrooms, baby carrots, or small potatoes around the roast.
   Do not continuously lift the slow cooker lid because each time it is opened, heat escapes and the cooking time increases. If the meat still feels tough, it usually needs more cooking time rather than less. Continue cooking until it pulls apart easily.
   Q&A
   Can I prepare this ahead of time?
   Yes. Season and sear the beef, slice the onions, and mix the broth ingredients the night before. Store everything covered in the refrigerator, then place it in the slow cooker and cook the following day.
   Can I use onion soup mix?
   Yes. You can add one packet of onion soup mix for stronger onion flavor. Reduce the added salt because soup mix can be quite salty.
   How should leftovers be stored?
   Refrigerate the beef and gravy in an airtight container for up to four days. Reheat slowly with a splash of beef broth to keep the meat moist.
   Approximate Nutrition Per Serving
   Calories: 430
   Protein: 38g
   Carbohydrates: 10g
   Fat: 26g
   Fiber: 1g
   Sodium: 620mg
   Nutrition values will vary depending on the cut of beef and serving size.