You can tenderize chuck steaks by pounding one out a bit in between two pieces of parchment or saran wrap with a meat mallet. Whisk together a mixture of olive oil, apple cider vinegar, salt and spices. Place the Chuck steak in a ziplock freezer bag and add the marinade. Mix and seal the bag. Refrigerate for 8-10 hours. Turn the steak occasionally to ensure it marinates evenly.
Remove the bag 30 minutes before cooking, this will bring it closer to room temperature which yields a more tender outcome.
Melt the butter and place the steak and thyme sprigs (optional) in the pan. Fry over medium heat for 3 minutes on one side for medium. Turn the chuck steak over to the other side and fry for another 3 minutes, pouring melted butter over the steak consistently.
Let the steak rest for 7-10 minutes, wrapping it in foil or placing a lid over the pan removed from the heat. Slice against the grain and serve.