Wonderfully rich! Warning however!! I tried this recipe to test it before I served it to company and made 4. With 4, as the recipe called for, it turned out exactly as expected at 18 minutes in my oven. The next day I adjusted the servings to 12. Instead of the nice cake-like batter I'd got the day before was more brownie batter-like. Chef John's Carrot Cake Chef John. Chef John's Carrot Cake Chef John. Chef John's Carrot Cake Sue + 13 13 more images. Recipe Summary test. prep: 15 mins . cook: 40 mins . additional: 40 mins . total: 1 hr 35 mins . Servings: 12 . Yield: 1 9x13-inch cake . Nutrition Info. Advertisement. Ingredients. Decrease Serving. 12.