Preparation

• Prepare a grill for cooking over medium heat.

• In a bowl, whisk together the milk powder, Parmesan, chives, dill, onion powder, granulated garlic, parsley, salt and sugar. Mix thoroughly to combine.

• Place the olive oil in a separate bowl and mix in 1 tablespoon of the spice mixture.

• Insert a bamboo skewer lengthwise through the center of each potato. With a sharp paring knife, cut a potato in a spiral pattern all the way down to the skewer, beginning at the top of the potato with the knife set at a 15 to 20 degree angle. Rotate the potato as you cut until the entire the potato is cut through in a spiral pattern. Stretch the potato down the skewer. Repeat with the remaining potatoes.

• Set each skewer over a piece of aluminum foil. Brush each of the potatoes with a generous amount of the oil mixture, reserving a third for later. Wrap the potatoes in the foil, closing both ends so the oil cannot escape. Place on the grill and cook 8 minutes, then flip and cook 8 minutes more. Remove from the grill and let rest until cool enough to handle. (Leave the grill on.)

• Remove the skewers from the foil. Brush each potato with some of the remaining oil mixture and return to the grill until well browned, 2 to 3 minutes per side. Transfer to a platter and sprinkle each with more of the dry spice mixture. (Extra spice mixture can be stored in an airtight container at room temperature for up to 2 months.)