In a large bowl mix ⅔ of the flour with the sweet potato puree. Season with salt and pepper, and a pinch of dried oregano (optional).
Transfer the dough to a clean surface, sprinkle the remaining flour on top and knead with your hands until you have a smooth, elastic dough. If it's still too sticky, sprinkle a little more flour and continue kneading for a few seconds.
With the help of a rolling pin, roll the dough into a large disk and transfer to a large baking tray covered with parchment paper.
Bake in the oven for 10 minutes, then remove from the oven.
Spread the marinara sauce over the base, and top with mozzarella chunks.
Return the sweet potato pizza to the oven and continue to bake for a further 10 minutes.
Remove the pizza from the oven, top with arugula leaves, drizzle with extra-virgin olive oil and serve.
Notes
How to make sweet potato puree:
Steam: Simply place halved sweet potatoes in a steamer, and steam for 10-15 minutes or until soft.
Air-fry: Pierce the sweet potato all over with a fork, then cook in the air-fryer for 35-40 minutes at 180°C/375°F.
Roast: Use a fork to poke holes all over the sweet potatoes, place them on a baking sheet, and roast for 40 minutes or until fork tender at 180°C/375°F.
Once the sweet potato is cooked through, transfer to a bowl and mash and mix with a whisk until creamy, or transfer to a food processor and blend until creamy.