Preheat oven to 450 degrees F. Lightly coat a baking sheet or pizza pan with olive oil.

Melt butter in a medium saucepan over medium heat. Add heavy cream and bring to a boil, stirring. Remove from heat and allow to rest until ready to use. Stir in the Parmesan; season with salt and pepper, to taste.

Working on a surface that has been sprinkled with semolina or cornmeal, roll out pizza dough into a 12-inch-diameter round. Transfer to prepared baking sheet or pizza pan.

Spread prepared Parmesan mixture evenly over the top, leaving a 1-inch border. Top with mozzarella, spinach and prosciutto.

Place into oven and bake for 15-20 minutes, or until the crust is crisp and brown on the bottom and the cheese is melted on top.

Cut the pizza into wedges and serve immediately.