Preheat your oven to 400°F. Add your cauliflower florets, olives, garlic, chili pepper flakes, salt and olive oil to a 9x13" baking dish. Toss everything to coat. Make some room in the center to place your feta. Drizzle it with a little more oil and top with chili flakes. Its okay if the florets are over-lapping. Bake for 15 minutes, then bump up the temperature to 425°F. and bake for another 20 minutes.
While that's roasting, cook your pasta al dente and reserve 1/2 cup pasta water for later.
Once the cauliflower is done, remove it ffrom the oven and mix everything IMMEDIATELY out of the oven. Add in your pasta water and pasta and mix to coat it all and get it nice and creamy. Top with basil and serve.