01 - Preheat your oven to 450°F. If using a pizza stone, place it in the oven to preheat.
02 - Heat olive oil in a skillet over high heat. Season the beef slices with salt and pepper and sear quickly, 1-2 minutes per side. Remove from heat; set aside.
03 - For Alfredo sauce, melt butter in a small saucepan over medium heat. Add garlic, sauté 1 minute. Stir in cream, bring to a gentle simmer. Add Parmesan, nutmeg, salt, and pepper. Stir until smooth. Remove from heat.
04 - Roll out pizza dough on a floured surface to desired thickness. Transfer to a parchment-lined baking sheet or preheated stone.
05 - Spread the 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, or until crust is golden and cheese is bubbling.
07 - Remove from oven, let cool 3 minutes, garnish with parsley, slice, and serve.