Brush the pizza crust with the olive oil and sprinkle with garlic powder.
Layer on the cheese.
Bake 5 minutes, then add the prosciutto. Bake 5-6 more minutes or until the prosciutto is slightly crisp and the cheese is melted.
Remove from the oven and immediately top with the arugula. It will wilt slightly under the heat of the pizza. Drizzle with a tablespoon more olive oil. Slice and serve.