Preheat oven to 475°F (245°C). Place pizza stone in the oven or dust baking sheet with cornmeal.
Roll out pizza dough into a 12-14 inch circle on a floured surface. Transfer to prepared baking sheet or pizza peel.
Spread alfredo sauce over dough, leaving a 1/2-inch border.
Add half of the mozzarella, artichoke hearts, red onion, and spinach.
Top with remaining mozzarella, parmesan, feta, and red pepper flakes (optional).
Slide pizza onto preheated stone or place baking sheet in the oven.
Bake for 12-15 minutes, until crust is golden and cheese is melted.
Remove pizza, let cool, and brush crust with olive oil.
Slice into 8 pieces and serve immediately.