This makes a soft crust pizza. For a crispier crust use a pizza screen or stone, and bake (instead of broil) until the cheese is melted.
A note about substitutions: because each type of protein powder has a distinct flavor and texture when baked, I would not recommend using other types of protein powder. If you prefer to use whey protein, see my
Sicilian Protein Pizza recipe. Also, don't leave out or substitute the
psyllium husk. It gives the crust the bread-like texture we need.