Step 1: Season. Pat the chuck roast dry with paper towels, then season it generously on all sides with salt, black pepper, smoked paprika, onion powder, and garlic powder. This is your “flavor foundation,” so don’t be shy!
Step 2: Sear. Heat a large skillet over medium-high heat and melt the butter. Once it’s hot, sear the roast on all sides until deeply browned. It only takes a few minutes, but it adds a rich, savory flavor you just can’t get from slow cooking alone.
Step 3: Transfer the seared roast into your slow cooker and place it right in the center.
Step 4: Add the veggies. Arrange the halved baby potatoes, carrots, and sliced onion around the roast. Try to keep everything roughly the same size so it cooks evenly and nothing turns mushy.
Step 5: Whisk the Sauce. In a bowl, whisk together the Coca Cola, Worcestershire sauce, beefy onion soup mix, brown gravy mix, and minced garlic until smooth and well combined.
Step 6: Pour & Cook. Pour the sauce evenly over the roast and vegetables. Cover and cook on LOW for 8 hours or HIGH for 6 hours, until the beef is fork-tender and pulls apart easily.
Step 7: Garnish & Serve. Sprinkle with fresh parsley if you’d like, then serve hot with plenty of that sweet-and-savory gravy spooned over the top.