Slow Cooker Beef Roast with Potatoes and Carrots | Boys Who Can Cook | Umami

Ingredients

• 1 medium onion (cut into wedges)
• 1 pound carrots (cut into large, 2 inch chunks)
• 1 ½ pounds baby potatoes (left whole)
• 4 cloves garlic (minced)
• 1 cup beef broth
• 2 tablespoons dijon mustard
• 1 teaspoon salt
• 1 teaspoon dried thyme
• 1/2 teaspoon dried rosemary
• 1/2 teaspoon pepper
• 3-4 pound chuck roast
• 1 tablespoon cornstarch (optional)