Crush lemon cookies in a plastic bag until only crumbs remain. Melt butter and combine with cookie crumbs in a small cookie or casserole dish. Flatten crumbs with the back of a spoon and then chill in the fridge. Once chilled, use a spoon to break up the cookies into small chunks.
Combine lemon juice, sugar, and blueberries in a saucepan on low heat and bring to a low boil. Let boil, stirring frequently for about 3 minutes. Add a little cornstarch if there is too much liquid. Let cool.
Prepare pudding as directed.
Layer each ingredient starting with pudding, cookies crumbs, blueberry syrup, pudding, and whipped cream. Garnish with fresh blueberries and extra cookie crumbs. Keep chilled until ready to serve.
Recipe by Uplifting Mayhem at https://www.upliftingmayhem.com/blueberry-lemon-mini-trifles/