Egg in a Portobello Mushroom.↓ You've more than likely eaten breakfast already but this recipe is so good, you won't mind making it a late brunch. Poached from E.A.T., this recipe is simple, innovative, healthy and delicious. Ingredients.↓ • 6 Modestly Large Portobello Mushrooms. • 6 Eggs. • 6 teaspoons of Virgin Olive Oil. • Salt. • Pepper.Egg in a Portobello Mushroom.↓ You've more than likely eaten breakfast already but this recipe is so good, you won't mind making it a late brunch. Poached from E.A.T., this recipe is simple, innovative, healthy and delicious. Ingredients.↓ • 6 Modestly Large Portobello Mushrooms. • 6 Eggs. • 6 teaspoons of Virgin Olive Oil. • Salt. • Pepper.