Place the prawns in a small bow with the olive oil, garlic and chilli. Toss to combine, then set aside.
Preheat oven to 220°C.
Spread the pizza base with the pizza sauce and scatter with cheese. Arrange the tomatoes, cut-side up over the base, then scatter over the prawn mixture, including the oil
Cook the pizza for 6-8 minutes, or until the prawns are just cooked and the cheese is bubbling and the bases are crisp.
Serve drizzled with pesto.