Cut a butternut squash into small cubes. Drizzle with olive oil, sprinkle with salt and pepper, and roast at 400ºF for about 20 minutes or until soft. Brush the crust with olive oil, top with a layer of ricotta cheese then scatter the squash on top. Bake for 5 minutes or according to pizza crust directions. Serve topped with baby arugula and toasted pine nuts.