Boil elbow pasta in salted water until al dente. Drain and set aside.
Make the cheese sauce:
In a medium saucepan, melt butter over medium heat. Whisk in flour to create a roux. Slowly add milk, whisking constantly until thickened. Stir in cheddar and mozzarella cheeses until smooth. Season with salt and pepper.
Combine:
Mix the cooked macaroni into the cheese sauce. Let cool slightly.
Assembly Steps:
Preheat your oven to 475°F (245°C) with a pizza stone or baking sheet inside.
Roll out the pizza dough on a floured surface into a 12-inch circle. Transfer to parchment paper.