In a mixing bowl, whisk together the flour, sugar, salt, and baking powder.

Add the yogurt and warm water to the dry mixture. Stir until a rough dough forms.

Transfer the dough onto a floured surface and knead for about 5 minutes.

Cover the dough with a kitchen towel and let it rest for 30 minutes.

While the dough rests, heat your skillet over medium-high heat.

Divide the dough into four equal pieces. Roll each piece into a ball, then flatten it into a disc about 1/4 inch thick.

Place the naan in the hot skillet and cook for 1-2 minutes on each side.

Once cooked, remove the naan from the skillet and brush with melted butter.