Preheat & Prep: Preheat oven to 425°F (220°C). Prepare your trifle dish or 9x13 pan.
Make the crust: Pulse flour, sugar, and a pinch of salt in a food processor. Add cold grated butter and pulse until it looks like wet sand. Press firmly into the bottom of your dish. Bake for 12-14 minutes until edges are deep golden. Cool completely on a wire rack.
Seal the crust: Melt white chocolate chips in 30-second bursts in the microwave. Brush a thin, even layer over the cooled crust. Let harden at room temperature, about 15 minutes.
Cook the lemon curd: In a medium saucepan over medium heat, whisk eggs, yolks, and sugar until smooth. Whisk in lemon juice and a pinch of salt. Cook, stirring constantly, until the mixture thickens and coats the back of a spoon (8-10 minutes).
Strain and finish: Immediately pour the curd through a fine-mesh sieve set over a large bowl. Whisk in cubed butter until melted and smooth. Pour over the sealed crust.
Set the curd: Refrigerate for at least 2 hours, or until fully firm and no longer jiggles.
Make the cream layer: Beat cream cheese, powdered sugar, and vanilla until smooth. In a separate bowl, whip heavy cream to stiff peaks. Gently fold whipped cream into cream cheese mixture. Spread evenly over set curd.
Final chill: Refrigerate for at least 2 more hours or overnight. The longer the better.
Garnish and serve: Right before serving, top with fresh blueberries and mint sprigs. Serve cold.