Peanut Butter Balls

Mix peanut butter, butter, vanilla and salt with a mixer until blended (try using an electric mixer on low). Add 2 cups powdered sugar, blend. Use additional powdered sugar until mixture can be shaped into a ball and will stay on a toothpick. Shape into about 1 inch balls and refrigerate until firm. Place chocolate chips and shortening in microwave-safe bowl. Microwave in 15 - 20 second increments, mixing in-between until chocolate is melted. (You can re-melt as needed when making balls). Insert toothpick into balls. Dip into chocolate, then remove excess. Place on a parchment lined tray. Remove toothpick and smooth over holes. Refrigerate until firm.