Place diced potatoes in a large pot and cover with cold water. Bring to a boil over high heat and cook for 10-12 minutes, or until potatoes are tender.
Drain potatoes and let cool.
In a small bowl, whisk together olive oil, vinegar, parsley, garlic powder, and salt and pepper.
In a large bowl, combine cooled potatoes, radishes, and dressing. Toss to combine.
Serve chilled.
Interesting Facts
Radishes are a member of the Brassicaceae family, which also includes broccoli, kale, and cabbage.
Potatoes are native to South America and were first cultivated by the Incas.
Parsley is a rich source of Vitamin C and Vitamin K, and is also a good source of iron and calcium.