Step 1: Sear the Beef: Heat olive oil in a large skillet over medium-high heat. Season the beef chuck roast with salt and pepper. Sear on all sides until browned, about 3-4 minutes per side. This step enhances the flavor of the beef.
Step 2: Saut the Vegetables: In the same skillet, add the chopped onion, carrots, and celery. Saut until softened, about 5-7 minutes. Add the minced garlic, dried thyme, and dried rosemary. Cook for another minute until fragrant.
Step 3: Combine Ingredients in the Crock Pot: Transfer the sauted vegetables to the bottom of the slow cooker. Place the seared beef chuck roast on top of the vegetables. Pour in the beef broth and stir in the tomato paste.
Step 4: Slow Cook: Cover the slow cooker and cook on low for 6-8 hours, or on high for 3-4 hours, or until the beef is fork-tender.
Step 5: Add Potatoes: During the last hour of cooking, add the quartered potatoes to the slow cooker. Ensure they are submerged in the liquid. Cook until the potatoes are tender.
Step 6: Thicken the Gravy (Optional): In a small bowl, whisk together the cornstarch and cold water to create a slurry. Pour the slurry into the slow cooker and stir gently to combine. Cover and cook for another 15-20 minutes, or until the gravy has thickened.
Step 7: Shred the Beef: Remove the beef chuck roast from the slow cooker and shred it with two forks. Return the shredded beef to the slow cooker and stir to combine with the vegetables and gravy.
Step 8: Serve: Serve the gluten-free slow cooker pot roast hot. Garnish with fresh parsley, if desired.
Optional Tips: For a richer flavor, add a splash of gluten-free Worcestershire sauce to the slow cooker. If you don't have Yukon Gold potatoes, russet potatoes can be used instead. For a thicker gravy, use more cornstarch slurry. Add other vegetables such as parsnips or turnips for variations.