Pre-heat oven to 425 degrees F.
Line a large rimmed baking sheet with parchment paper.
Open bag and dump frozen vegetables onto baking sheet. Break up any stuck together pieces.
Drizzle with olive oil, toss to coat, and spread out in baking sheet in a single layer leaving space between vegetables if possible.
Season with salt.
Place in oven and roast for 25 minutes or until vegetables are slightly browned. They may be more browned on the bottom than the top. For beets or root vegetables, it may take closer to 35-40 minutes.
If desiring crispier vegetables, increase temp to 475 or broil for a couple of minutes, taking care not to burn.
Remove from oven, taste, and add more salt and pepper if needed.