Instructions: Preheat oven to 450-F degrees. In food processor, whirl flour, baking powder, cream of tartar, sugar, and salt. Cut butter in chunks and add to container. With quick on-off bursts, incorporate it into flour mixture. With motor running, add milk through feed tube, being careful not to overmix.
Turn out onto lightly floured board, and knead for 30 seconds or so. Roll out to 3/4 inch thickness, forming into as regular a rectangle as possible. With a sharp knife, cut dough into squares, then into triangles; place them a little apart on a baking sheet. Bake for 12-15 minutes, watching to be sure they turn a lovely golden brown but dont get overdone.
(If you wish to make them ahead, you might choose to bake for the shorter time and plan to reheat just before the party.)
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