Preheat your oven to 425°F (220°C).
Remove the pre-cooked polenta from its tube and slice it into fry shapes, about 1/4 to 1/2 inch thick.
In a mixing bowl, combine olive oil, garlic powder, onion powder, rosemary, salt, and pepper. Toss the polenta fries in the mixture until evenly coated.
Spread the seasoned polenta fries in a single layer on a baking sheet.
Bake for about 25-30 minutes, flipping halfway through, until golden brown and crispy.
Let them cool for a minute before serving with your favorite dipping sauce.