The BEST Slow Cooker Beef Stew

Name: The BEST Slow Cooker Beef Stew
Prep time: 20 min
Cook time: 8 h
Total time: 8 h 20 min
Cuisine: American
Ingredients: 1 tbsp neutral oil (avocado oil is best); 2.5 lbs chuck roast; 2 tsp salt; 1 tsp black pepper; 1/2 tsp celery salt; 1/2 tsp garlic powder; 2 tbsp butter; 1 yellow onion, diced; 5 garlic cloves, minced; 4 carrots, peeled and chopped into chunks; 1 lb baby yukon potatoes, sliced into quarters; 1 cup red wine, cabernet or merlot; 4 cups beef broth; 3 tbsp tomato paste; 2 tsp better than beef bouillon; 2 tsp worcestershire; 2 bay leaves; 2 rosemary sprigs; 1 cup frozen peas; 1/4 cup water; 3 tbsp corn starch