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Slow Cooker Garlic Onion Pot Roast

Sophia
Is there anything more comforting than walking into a home filled with the rich aroma of a slow-cooked pot roast? This slow cooker garlic onion pot roast is the ultimate set-it-and-forget-it meal, delivering fall-apart tender beef infused with deep, savory flavors. The combination of caramelized onions, whole garlic cloves, and a perfectly balanced cooking liquid creates a dish that feels both rustic and sophisticated.
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Prep Time 15 minutes
Cook Time 8 minutes
Total Time 8 minutes
Calories 420 kcal

Ingredients
  

For the Roast

  • 3–4 lb beef chuck roast
  • 2 tablespoons olive oil
  • 2 teaspoons salt
  • 1 teaspoon black pepper
  • 1 teaspoon garlic powder
  • 1 teaspoon onion powder
  • 1 teaspoon smoked paprika
  • 1 teaspoon dried thyme
  • 1 teaspoon dried rosemary

Vegetables

  • 2 large yellow onions, sliced
  • 8–10 whole garlic cloves, peeled
  • 2 tablespoons butter

Cooking Liquid

  • 2 cups beef broth For a deeper flavor, use homemade beef broth if available.
  • 2 tablespoons Worcestershire sauce
  • 2 tablespoons soy sauce Low-sodium soy sauce can be substituted if watching salt intake.
  • 1 tablespoon Dijon mustard
  • 1 tablespoon balsamic vinegar
  • 1 tablespoon brown sugar
  • 1 teaspoon Italian seasoning
  • 2 bay leaves

Optional Gravy

  • 2 tablespoons cornstarch
  • 2 tablespoons cold water

Instructions
 

Season and Sear

  • Pat the roast dry with paper towels to ensure a good sear. Season all sides with salt, pepper, garlic powder, onion powder, smoked paprika, thyme, and rosemary.
  • Heat olive oil in a large skillet over medium-high heat. Sear the roast for 3–4 minutes per side until deeply browned. This step locks in flavor and enhances texture.

Prepare the Slow Cooker

  • Place sliced onions and whole garlic cloves at the bottom of the slow cooker. Add butter on top of the onions. Transfer the seared roast onto the bed of onions and garlic.

Add the Liquid

  • In a mixing bowl, whisk together beef broth, Worcestershire sauce, soy sauce, Dijon mustard, balsamic vinegar, brown sugar, and Italian seasoning. Pour this mixture around the roast, then add bay leaves.

Slow Cook

  • Cover and cook on: - Low for 8–9 hours - High for 5–6 hours The roast is done when it shreds easily with a fork.

Make the Gravy (Optional)

  • Remove the roast and keep it warm. In a small bowl, whisk cornstarch with cold water to make a slurry. Stir this into the slow cooker’s liquid. Cook on High for 10–15 minutes until the gravy thickens.

Serve

  • Slice or shred the roast and spoon the onion-garlic gravy over the top.