To Make the Potatoes:
- Heat the oven to 425°F. Line a baking sheet with parchment paper or a silicone baking mat.
- Wash potatoes and place them in a pot. Cover with water and bring to a boil. Boil with 10-25 minutes, or until soft enough to pierce with a fork.
- While potatoes are boiling, you can make the sauce. (Recipe follows.)
- Drain the potatoes and return to the pot. Turn the heat on for just a moment to allow the remaining water to evaporate, then turn it off.
- Add the oil, garlic powder, parmesan, and salt and pepper (if using) and stir or shake the pot to evenly coat the potatoes.
- Spread the potatoes on the baking sheet. Use the back of a spoon to press on each potato to 'smash' it flat, leaving a little room between potatoes so that you get a nice roast instead of steaming them.
- Roast potatoes for 15 minutes, or until golden and crispy on the tops.
To Make the Basil Yogurt Sauce:
- Add all ingredients to a food processor and blend until smooth, stopping to scrape down the sides as necessary. Taste and adjust as needed.
- The sauce can be made ahead and kept in the refrigerator for up to 3 days.