In 1 qt microwave-safe bowl, microwave margarine and brown sugar on 100% power (high) 1 to 1-1/2 minutes, stirring every 30 seconds or until brown sugar is melted. Stir in powdered sugar, peanut butter and vanilla. Shape by teaspoonfuls into egg shapes. Chill.

 

In double boiler or heavy saucepan, over low heat, melt chocolate chips and shortening. With wooden pick, dip each egg into chocolate mixture, coating completely. Place on wax paper-lined baking sheets. Chill. Store in refrigerator.