Preheat oven to 400F and line a baking sheet with baking paper.
Slice the cooled down and hardened polenta into 1/2 inch slices and place the slices on the lined baking sheet. Drizzle olive oil on top along with oregano, sea salt and nutritional yeast (or other non-dairy cheese or parmesan cheese).
Bake the polenta in the middle of the oven for 25 minuted or until the polenta is golden and crispy on the outside.