To be clear, pizza can never be replaced in our starchy, starchy hearts. But this recipe gets pretty damn close. To those living the low-carb, gluten-free life -- or just, you know, week -- portobello mushrooms are a hearty, umami-rich sub-in for the standard dough-based crust. Covered in bright tomato sauce, gooey cheese, and pepperoni (or any topping you like!), it won't taste like diet food. Recipe here.