Preheat the oven to 425 degrees F.
Peel the parsnips and trim off the tops. Then cut them into 2-inch-long pieces. If the diameter of the parsnips is larger than a half inch, slice them in half or quarter them lengthwise.
In a large bowl, whisk the olive oil, balsamic vinegar, maple syrup, mustard, garlic powder, onion powder, red pepper flakes, salt and pepper.
Stir the parsnips into to the oil-balsamic-maple mixture until they are well coated.
Spread the parsnips across a sheet pan into a single layer without overlapping, leaving the excess liquid in the bowl.
Roast the parsnips for 20 minutes. Flip them over and continue roasting for 10-12 minutes until the parsnips are browned on the edges and tender in the middle.
Toss the parsnips with chopped fresh herbs before serving.