Preheat the oven to 425 degrees. Line a rimmed baking sheet with parchment paper.
Place the potatoes, onions, and carrots on the baking sheet, and drizzle with the olive oil. Use your hands to make sure the vegetables are covered evenly in oil.
Season with salt and pepper.
Bake at 425 degrees for 40-50 minutes, stirring occasionally. Season with more salt and pepper if desired. Enjoy!