In a bowl, combine first four ingredients. Add milk and mix well. Roll into 1-inch balls and place on a waxed paper-lined cookie sheet. Chill for 20 minutes.
Flatten with a glass to 1/4 inch; chill for 30 minutes.
In a double boiler or microwave-safe bowl, melt chocolate chips and shortening. Dip patties; place on waxed paper to harden and freeze for a short while.