how to cook Vegan Recipe Polenta Pizza Bites Pizza - March 16, 2017 0441 Heat oven to 450 degrees; brush a layer of olive oil on a pizza pan or cookie sheet. ... Stir 1 tablespoon oil into cooked cornmeal (polenta). ... Put polenta in oven and bake for 25 to 30 minutes, or until it begins to brown and crisp on edges.