Preheat grill on high.
Cook the cauliflower with a splash of water in the microwave on high for 5 minutes, or until soft.
Cook the macaroni for 1 minute less than on the packet instructions, drain and set aside.
In a frypan, heat the chipotle paste and smoked paprika for 2 mins then add the milk and cheese spread and heat through.
Add the cauliflower to a food blender along with the sauce. Blitz until smooth.
Drain the pasta and pour into an ovenproof dish. Cover with lashings of cheese sauce and stir through the cherry tomatoes and peppers. Sprinkle the top with grated cheese, a little black pepper and a pinch of smoked paprika to finish.
Place under the grill and heat until the cheese has melted and is a golden-brown colour, which should take around 5 minutes.