NOTE: To make sour milk, add 1 teaspoon white vinegar to 1 cup milk.
Blend flour, butter and cinnamon until mixture resembles cornmeal. Reserve 1 cup flour mixture for top.
Add sugar, nutmeg, salt, egg, sour milk and baking soda; blend slowly.
Pour into greased 9-inch square baking dish.
Sprinkle reserved crumb mixture on top.
Bake at 350 for 30 minutes, or until straw inserted in center comes out clean.