1. Process first 7 ingredients in a blender 30 seconds or until very smooth. Cover and chill at least 2 hours or up to 2 days.
2. Pour mixture into freezer container of a 1 1/2-qt. electric ice-cream maker, and freeze according to manufacturer's instructions. (Instructions and times may vary.)
3. Mash together blueberries, blueberry preserves, and lemon zest. Stir mixture into prepared ice cream. Freeze 1 hour before serving. Serve immediately, or transfer to an airtight container, and freeze up to 1 week.
*Vanilla extract may be substituted.
THE COOKIE: Snickerdoodles, soft-baked from your bakery, for towering ice-cream cookie sandwiches. Wrap the finished treats individually (and tightly) in plastic wrap, and keep on hand in the freezer for parties or snacks.