Step 1 Preheat oven to 220°C. Place 2 baking trays in the oven to heat.
Step 2 Spray a large non-stick frying pan with olive oil spray to lightly grease. Heat over medium-low heat. Add the chicken and cook, stirring occasionally, for 2 minutes or until golden and just cooked through. Transfer to a plate. Add the onion to the pan and cook, stirring frequently, for 8-10 minutes or until soft and golden. Add the sugar and cook for 1 minute or until sugar dissolves.
Step 3 Spread the passata evenly over the pizza bases. Scatter over the onion mixture. Top with the sweet potato, chicken and goat's cheese. Season with salt and pepper.
Step 4 Remove the baking trays from oven and place the pizzas on top. Bake in oven, swapping trays halfway through cooking, for 15-20 minutes or until the potato is soft and the bases are crisp.
Step 5 Top the pizzas with rocket and season with salt and pepper. Cut into slices and serve immediately.