Preheat the oven to 450º F., and cut the vegetables into ¼- inch thick slices.
With a cookie cutter or a knife, cut the slices into Halloween shapes.
Place your Halloween vegetables over a baking sheet with parchment paper, and make sure to separate them enough since the beetroot can stain the other vegetables. Drizzle your vegetables with oil, and sprinkle with salt, ground pepper, onion powder, and garlic powder. Toss to evenly coat.
Place your vegetables inside the oven and bake for 40 minutes, or until golden and crispy. Once done, remove them from the oven and let them sit for 10 minutes before serving.
Notes
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.