Preheat oven to 425F. Line rimmed baking sheet with parchment paper.
In a large bowl, whisk together flour, sugar, baking powder, and salt. Add yogurt and 1/4 cup of milk. Stir until dough forms, then transfer to lightly floured countertop. Knead until dough is smooth and fairly sticky.
Roll dough out quickly using a floured rolling pin, about 1 inch thick. Cut into 3-inch rounds.
Place 1 inch apart on prepared baking sheet and bake about 15 minutes, until golden brown.