Braise it low and slow in the oven at 300°F for 3–4 hours with liquid (broth, wine, whatever you've got). Or slow cooker on low for 8–10 hours. Brown it well on all sides first, that crust adds flavor to the whole dish. Add carrots, potatoes, and onions for a complete meal. The cooking liquid turns into great gravy.
Your house will smell good all afternoon. That's just part of the deal.
This chuck roast comes from the shoulder of the animal, a hardworking muscle with lots of connective tissue. That connective tissue is the point: cooked low and slow, it breaks down into gelatin, which makes the meat fall apart and the sauce silky.
Keep frozen until ready to use for up to 12 months. Thaw in the refrigerator overnight, or quick thaw in a bowl of cold water if you're in a hurry (just keep it in the sealed package). Keep thawed chuck roast in the fridge for 1-2 days, or refreeze immediately if not using.