Slow Cooker "Melt in Your Mouth" Pot Roast

Ingredients

• 1 chuck roast ((mine was 3 pounds))
• Olive oil
• 1 pound carrots (, peeled and cut into large chunks)
• 2 pounds potatoes (, peeled and cut into large chunks)
• 1 onion (, peeled and cut into large chunks)
• 2 stalks celery (, cut into large chunks (optional))
• 1 cup beef broth
• 1 tablespoon corn starch
• 2 tablespoons steak seasoning ((mine is store-bought and has a blend of peppercorns, garlic, paprika, parsley and salt))
• 1 tablespoon kosher salt
• 1 tablespoon dried thyme
• 1 tablespoon dried rosemary