Season your chuck roast with the salt, pepper, paprika, onion powder and garlic powder.
In a large skillet over medium high heat melt your butter.
Sear the roast in the skillet until browned on each side.
Add the roast to the slow cooker.
Add the potatoes, carrots and onion around the roast.
Whisk together the coca cola, worchestershire sauce, beefy onion soup mix, brown gravy and garlic together.
Pour the sauce over the roast and veggies.
Cover and cook on low for 8 hours or high for 6 until the meat is tender and falls apart.
Garnish with parsley and serve!