01 - Preheat oven to 450°F. If using a pizza stone, place it in the oven during preheating.
02 - Heat olive oil in a skillet over high heat. Season beef slices with salt and pepper. Sear quickly for 1-2 minutes per side. Remove from heat and set aside.
03 - Melt butter in a small saucepan over medium heat. Add garlic and sauté for 1 minute. Stir in heavy cream and bring to a gentle simmer. Add Parmesan cheese, nutmeg, salt, and pepper. Stir until smooth and remove from heat.
04 - Roll out pizza dough on a floured surface to desired thickness. Transfer to a parchment-lined baking sheet or preheated pizza stone.
05 - Spread Alfredo sauce evenly over the dough, leaving a ½-inch border. Sprinkle mozzarella and provolone cheeses over the sauce. Distribute cooked beef and red onion slices on top.
06 - Bake for 14-18 minutes until crust is golden brown and cheese is bubbling.
07 - Remove from oven and let cool for 3 minutes. Garnish with fresh parsley, slice, and serve immediately.