Preheat oven to 450 degrees
Line baking sheet or pizza pan / stone with parchment paper
Steam zucchini on stovetop for a 2-3 minutes or microwave for 1 minute
Wring as much moisture as possible out of zucchini with tea towel
In medium bowl, whisk together egg, egg whites, baking powder, and spices
Spoon mixture onto baking sheet and flatten evenly into circle or rectangle about 1/4 inch thick
Bake about 10-12 minutes, until starting to brown
Remove from oven to add sauce, cheese, and desired toppings then baking another few minutes until cheese is melted