There are two possible routes. First, you can make a cheese-less pizza with red sauce and lots of veggies, like caramelized onions, sautéed mushrooms, fresh tomatoes, and arugula. There are ENDLESS toppings AND sauces without meat and dairy. Alternatively, you can make a cheese sauce with vegan cheese (like the recipe here), or simply replace the dairy cheese with vegan cheese shreds 1:1.