Slow Cooker Beef Stew

 

• 1 1/2 pounds potatoes, peeled and cubed
• 6 medium carrots, cut into 1-inch slices
• 1 medium onion, coarsely chopped
• 3 celery ribs, coarsely chopped
• 3 tablespoons all-purpose flour
• 1-1/2 pounds beef stew meat, cut into 1-inch cubes
• 3 tablespoons vegetable oil
• 1 can (14-1/2 ounces) diced tomatoes, undrained
• 1 cup beef broth
• 1 teaspoon ground mustard
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 1/2 teaspoon dried thyme
• 1/2 teaspoon browning sauce