Don't ask me who Mary is, 'cause I don't know! I found this recipe in some hand-written files. These are easy to make (like most biscuits) and taste great with butter and jam, berries and cream, or a slightly sweet dinner dish.
In a large bowl, combine flour, sugar, baking powder, cream of tartar, and salt. Cut in shortening with a pastry blender (or 2 knives) until mixture resembles coarse crumbs. Stir in milk and vanilla extract and mix until just combined.
Drop biscuits onto a cookie sheets (use a 1/4 cup measure and space 2 inches apart).
Place cookie sheets on 2 oven racks near the center of the oven. Bake biscuits for 12-15 minutes, until they are golden brown, rotating cookie sheets between the upper and lower racks halfway through baking time.