Preheat the oven to 450. Line a large baking sheet with parchment paper.
Cut the cooked polenta into ½ X ½ X 3 inch segments. Place them on the baking sheet. Drizzle the oil over the top, then sprinkle with ¼ teaspoon salt, ¼ teaspoon pepper, and 1/8 teaspoon garlic powder. Gently toss to coat the polenta fries in oil and seasoning.
Spread the fries out in a single layer. Bake for 20 minutes. Then flip and bake another 15-20 minutes.
Serve baked polenta fries warm with marinara or Caesar dressing.