Cut the polenta block into strips and place them on a baking sheet lined with parchment paper.
Drizzle the top with a little olive oil and season with a pinch of salt and pepper. If you like, you can also add some oregano.
Bake at 200°C (400°F) for about 20 minutes: bake for the first 10 minutes using the standard oven setting, and switch to convection (fan-assisted) for the remaining 10 minutes.
Meanwhile, prepare the sauce by combining the tomato passata, basil leaves, a pinch of salt, and a drizzle of olive oil in a small saucepan.
Simmer over medium heat for about 10 minutes. If desired, add a little red pepper flakes or chili to make the sauce spicy.