Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Once the oil is shimmering, add the 3-pound chuck roast, browning it on all sides for about 4-5 minutes each. Searing develops a rich crust that locks in flavors, so don’t rush this step. Remove the roast from the skillet and set it aside on a plate.

In the same skillet (adding more oil if necessary), sauté the chopped medium yellow onion for about 2 minutes until it softens and turns translucent. Then, add the minced garlic cloves and cook for another 30 seconds, making sure not to let them burn. This aromatic base will enhance the depth of flavor in your Crock Pot Roast.

Transfer the browned roast into your slow cooker, then scatter the sautéed onion and garlic mixture over the top. Now, layer in the whole Yukon Gold potatoes and 1-inch pieces of medium carrots around and on top of the roast. This arrangement ensures that everything cooks evenly while allowing the flavors to meld beautifully.

Pour in 1 1/4 cups of beef broth and 2 teaspoons of Worcestershire sauce over the roast and vegetables. Season generously with salt and freshly ground black pepper to taste. Stir gently to combine the ingredients and ensure that the flavorful liquid seeps around the roast for that comforting essence of this Ultimate Slow Cooker Pot Roast.

Cover the slow cooker and set it to cook on low heat for 8-9 hours. This slow and low method not only tenderizes the meat but allows the flavors to develop fully. You'll know it’s done when the roast is fork-tender and the vegetables are perfectly cooked, creating a comforting, homestyle meal.

If you prefer a thicker gravy, strain the cooking liquid into a saucepan and whisk together 2.5 tablespoons of cornstarch with a little cold broth. Stir this mixture into the strained liquid and simmer over medium heat until the gravy thickens to your desired consistency. This luscious sauce will elevate your Crock Pot Roast to new heights of deliciousness.

Carefully slice or shred the succulent pot roast and arrange it on a platter with the beautifully cooked vegetables. Drizzle the thickened gravy over the top, and finish with a sprinkle of chopped fresh parsley for a touch of color. Your Ultimate Slow Cooker Pot Roast is now ready to be served, offering warmth and comfort with every delicious bite.