In a large bowl, whisk together the gluten free all-purpose flour, baking powder, and salt.
Add the plain yogurt and warm water. Stir with a spoon until the mixture comes together, then knead gently with your hands to form a soft dough. Let rest for 15 minutes.
Divide the dough into 6 equal pieces and roll each piece out into an oval shape about 1/4 inch thick.
Heat a heavy cast-iron skillet over medium-high heat. Place one piece of dough onto the hot, dry skillet.
Cook for 1 to 2 minutes until large bubbles form on the surface and the bottom is browned, then flip and cook for another minute.
In a small bowl, mix the melted butter, minced garlic, and fresh chopped cilantro. Brush this generously over the warm naan as soon as it comes off the skillet.