Preheat oven to 450°. In a large bowl, whisk flour, baking powder, sugar, salt and cream of tartar. Cut in butter until mixture resembles coarse crumbs. Stir in cheese, garlic and pepper flakes. Add milk; stir just until moistened.
Drop dough by heaping 1/4 cupfuls 2 in. apart onto a greased baking sheet. Bake 18-20 minutes or until golden brown. Serve warm.
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