Heat oven to 425 F. Lightly grease cookie sheet. Combine dry ingredients; cut in margarine until mixture resembles coarse crumbs. Stir in cheese. Combine sour half and half and milk; add to dry ingredients, mixing just until moistened. Shape dough to form a ball; knead gently on lightly floured surface 10 to 12 times. Roll dough to 3/4 inch thickness. Cut with floured 2-inch biscuit cutter. Place 1 inch apart on prepared cookie sheet. Bake 10 to 12 minutes or until golden brown. NUTRITIONAL ANALYSIS per biscuit: * calories 200 * carbohydrates 18 g * protein 5 g * fat 12 g * calcium 93 mg * sodium 560 mg * cholesterol 10 mg * dietary fiber 0 g