Toss potatoes in the olive oil, salt, and paprika until covered. Arrange in a single layer on a baking sheet and roast for 25 minutes, flipping half way through.
Meanwhile, combine all the herb sauce ingredients in a food processor and blend until smooth.
When the potatoes are tender, let them cool for 10 minutes. Pour into a large bowl and cover with the herb sauce. Put the potatoes in the fridge for at least one hour to allow potatoes to absorb the flavors. Serve cold or warm.