These Portobello Mushrooms Pizzas are just 51 calories and come with 10 optional pizza toppings.Save calories, carbs, and sugar, and make these plant based gluten-free pizzas. Special Tip: If you have picky eaters, let them top their own pizzas... then they can add lots of toppings and have more ownership in the dish. It's how I get my pickle eater to eat healthy pizzas!