Preheat your oven to 425℉ and line a baking sheet with parchment paper.
Cut the clean potatoes in half, then toss in olive oil, garlic powder, onion powder and salt.
Place the potato halves face down and spread out on the baking sheet, then cover with foil and bake for 25 minutes. While you wait, prepare the other ingredients.
After the 25 minutes, remove the foil and cook for 10 more minutes.
Pesto Vinaigrette
Add all ingredients to a food processor (or high powdered blender) and blend until smooth.
Warm Arugula and Pesto Potato Salad
If serving a group right away, while the potatoes and cooked peas are still warm, add all ingredients to a large bowl and mix together.
If making ahead of time, opt to keep the arugula stored separately so that it stays super fresh.