Pot Roast Over Mashed Potatoes (Tender Dutch Oven Dinner) - My Home Made Recipe

Ingredients

• 3 lb (1.4 kg) beef chuck roast
• 2 teaspoons kosher salt
• 1 teaspoon black pepper
• 2 tablespoons neutral oil
• 1 large yellow onion, chopped
• 3 carrots, peeled and cut into 2-inch pieces
• 2 celery stalks, chopped
• 4 cloves garlic, minced
• 2 tablespoons tomato paste
• 1/2 cup (120 ml) dry red wine, or more beef broth
• 2 cups (480 ml) beef broth
• 1 tablespoon gluten-free Worcestershire sauce
• 3 fresh thyme sprigs, or 1 teaspoon dried thyme
• 2 bay leaves
• 3 lb (1.4 kg) Yukon Gold potatoes, peeled and cut into chunks
• 1 1/2 teaspoons kosher salt, plus more for boiling water
• 6 tablespoons (85 g) unsalted butter
• 3/4 cup (180 ml) warm whole milk
• 1/2 teaspoon black pepper
• 2 tablespoons cornstarch
• 2 tablespoons cold water
• 2 tablespoons chopped fresh parsley, for serving