1To make the dough, combine the flour, sugar, baking powder, and salt in the bowl of an electric mixer fitted with a paddle attachment and mix together. Whisk the egg and yogurt in a bowl, then whisk in the water and oil. Pour the liquid ingredients into the dry ingredients. Using the dough hook, knead the dough for about 5 minutes. Turn the dough out onto a floured board, form it into a ball, and divide it into 10 equal pieces. Form each piece into a ball, place on a baking sheet lined with parchment paper, cover with plastic wrap, and rest for at least 1 hour or up to 1 1/2 hours.
3To make the filling, combine the mint, cilantro, garlic, ginger, cashews, and salt in a food processor. Process until finely chopped. Scrape down the sides, turn the machine back on, and pour in the oil. Scoop the filling into a small bowl.