Crockpot Beef Stew

Name: Crockpot Beef Stew
Prep time: 30 min
Cook time: 4 h
Total time: 4 h 30 min
Cuisine: American
Ingredients: 2 pounds beef chuck roast ( or stewing beef); 3 tablespoons all-purpose flour; 1 teaspoon salt; ½ teaspoon black pepper; ½ teaspoon garlic powder; 3 tablespoons olive oil (divided); 1 yellow onion (chopped); 4 cups beef broth (divided, or beef stock *see note); 3 cups potatoes (peeled and diced*); 2 large carrots (cut into 1-inch pieces, about 2 cups); 3 ribs celery (cut into 1-inch pieces, about 1 cup); 1 cup vegetable juice (such as V8); 1 tablespoon Worcestershire sauce; 1 teaspoon dried rosemary (or 1 sprig fresh); ½ teaspoon dried thyme leaves (or 2 sprigs fresh thyme); 2 tablespoons cornstarch; 2 tablespoons water; ¾ cup frozen peas; salt and black pepper (to taste)