Trim the beef roast, removing some of the excess fat. Cut it into 4 large pieces. Heat oil in large skillet over medium high heat. Mix flour, salt, and pepper. Coat each piece of beef in flour mixture, and sear until browned on all sides, about 4 minutes per side. Place in slow cooker.
1 tablespoon oil, 3 to 4 pounds boneless chuck beef roast, 2 tablespoons all purpose flour, 1 teaspoon salt, ½ teaspoon ground black pepper
Prep the vegetables. Peel and slice the onion in half, then into half moons. Slice the carrots and celery into 1-inch pieces. Mince the garlic and chop the parsley. Drain and roughly chop the roasted red peppers.
1 large onion, 2 large carrots, 1 large celery stalk, 3 cloves garlic, ¼ cup chopped fresh parsley, 1 jar (12 ounces) roasted red peppers
In a large bowl, lightly stir together the onion, carrots, celery, garlic, parsley, roasted red peppers, oregano, basil, thyme, bay leaf, and tomato sauce. Pour the mixture over the beef in the crockpot.
½ teaspoon dried oregano, 1 teaspoon dried basil, ¼ teaspoon dried thyme, 1 bay leaf, 1 can (15 ounces) no-salt-added tomato sauce
Cover and cook on high for 5 hours, or on low for 10 hours, until meat is tender. Turn crockpot off and allow the pot roast to cool in the juices for 15 minutes.
Lightly shred the meat, or cut it into chunks, and serve with the vegetables and sauce over mashed potatoes, polenta, or pasta.
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Notes
Variation: If desired, substitute a 14.5 ounce can of stewed tomatoes for the roasted red peppers.
Storage: Italian pot roast is almost better the next day. Refrigerate leftovers overnight in an airtight container and reheat on the stove over medium-low heat. Leftovers can also be frozen for 2 to 3 months. Thaw overnight in the fridge before reheating.
Nutrition: Calculated for 3 pounds of beef (8 servings), along with the vegetables and sauce.