Rinse and dry 12 baby potatoes. You can use any variety. Red potatoes are my favorite because they are the lowest on the glycemic index of all the potato varieties.
Add the butter and fresh garlic cloves to a small bowl. I love using my favorite stainless steel garlic press to crush the garlic quickly. Mix the butter and garlic together with a spatula until combined. Grate the parmesan cheese using a zesting grater. The smaller size of the cheese shreds allows them to get between the potatoes in the air fryer.
Combine the oil, paprika, onion powder, and salt in a bowl and shake to combine. Cut each potato in half. Cut four diagonal score lines on the soft side of each potato half about 1/8" deep. You do not need to slice all the way into the potato. Drop the sliced potatoes into the bowl and toss with oil mixture.
Tear off a sheet of aluminum foil twice as wide as your air fryer basket. Fold it in half with the shiny side on the inside. The dull side is non-stick, so you'll want it on the outside. Then fold up about .5" of foil on all four edges creating a foil baking sheet that can contain the melting butter in the air fryer.
Spread the garlic butter in the tray using a spatula. Then sprinkle about 1 -2 teaspoons of coarse sea salt on the butter. Next, sprinkle half of the grated parmesan cheese on the butter.
Place all the potato halves facing down in the tray. Scoot them all close to each other. Sprinkle with a dash of pepper. Carefully lower the tray into the air fryer.
If you're using small baby potatoes, cook them for 10 minutes at 400°F. If you use larger baby potatoes, cook them for 12 minutes at 400°F.When the timer goes off, remove the basket from the air fryer and carefully place it on a heat-resistant surface. Sprinkle on the chopped parsley and remaining parmesan cheese. Return the basket to the air fryer and bake for 2 more minutes at 380°F. Once it's done, carefully remove the foil tray from the basket and serve!