In a mixing bowl, combine the flour, salt, and baking powder.

Add the chilled butter to the dry mixture and mix until it resembles coarse crumbs.

Gradually drizzle in the cold water, mixing gently with a fork.

Form the mixture into a ball using your hands, being careful not to overwork the dough.

Wrap the dough in plastic wrap and refrigerate for at least 30 minutes.

On a floured surface, roll out the dough to about 1/8 inch thick.

Use a cookie cutter or glass to cut out circles from the dough, about 4-5 inches in diameter.

Add your desired filling to one half of each circle, fold the dough over, and pinch the edges to seal.