PREHEAT oven to 425ºF. Mix flour, baking powder, sugar and salt in large bowl. Cut in butter with pastry blender or two knives until mixture resembles coarse crumbs. Stir in cheese, apples and onions. Add milk; stir just until dry ingredients are moistened. (Do not overmix.)
DROP 1/4 cupfuls of dough onto greased or parchment paper-covered baking sheet
BAKE 15 min. or until lightly browned. Remove to wire racks; cool slightly. Serve warm.
serving size = 1 biscuit (50 g)