01 -
Preheat the oven to 220°C.
02 -
In a large mixing bowl, whisk together olive oil, Dijon mustard, whole grain mustard, garlic powder, onion powder, salt, and black pepper until the mixture is smooth and well combined.
03 -
Add the halved baby potatoes to the bowl and toss thoroughly until every piece is evenly coated with the mustard mixture.
04 -
Spread the coated potatoes in a single layer on a baking tray lined with parchment paper.
05 -
Roast in the preheated oven for 25 to 30 minutes, stirring halfway through, until the potatoes are crisp and golden-brown.
06 -
Remove the potatoes from the oven, allow them to cool slightly, and garnish with chopped fresh parsley before serving if desired.