Heat oven to 400°F. Toss squash with two tablespoons of olive oil, salt, and pepper. Roast for 20-25 minutes then remove from oven and reserve.
Spread ricotta cheese on crust to the edge.
Heat pizza oven to 500°F.
Add mozzarella cheese. Top pizza with spinach, prosciutto, bacon topping, garlic, and squash. Bake for 5-6 minutes until crust is crisp and browned. Remove from oven.