In a food processor, combine all gratin ingredients: breadcrumbs, garlic, chili and salt.Add butter. Set aside.Sauté onion and garlic in oil at medium heat without browning them.Add flour and cook for about 1 minute.Add milk and continue cooking until béchamel sauce thickens, about 3 to 4 minutes.Add Oka cheese and let completely melt in the white sauce.In a large pot, cook pasta for approximately 5 minutes.Add cauliflower and continue cooking for about 1 to 2 minutes. Drain.In a large oven-proof dish, place pasta and cauliflower, pour béchamel sauce and cover with breadcrumb mix.Cook in a 180°C (350°F) oven for about 45 minutes or until topping is golden.

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1/2 cup (250 g) macaroni or other short pasta 1/2 cauliflower (cut in small pieces) (1 lb)