Prepare the Crust: Begin by mixing your all-purpose flour, powdered sugar, and salt in a bowl. Then, cut in cold butter until it resembles coarse crumbs. Whisk egg yolks and vanilla extract together, then blend into the mixture until it forms a dough. Refrigerate for at least 30 minutes to relax the gluten.
Pre-bake the Crust: Preheat your oven to 350°F (175°C). Roll out the chilled dough to a ¼-inch thickness and place it in your tart tins. Poke holes in the bottom, then line with foil and fill with pie weights. Bake for 10 minutes, then remove weights and foil, and bake for an additional 5-7 minutes until lightly golden.
Make the Ganache: In a saucepan over low heat, combine heavy cream and blueberries, stirring gently until the blueberries soften. Then, remove from heat and mix in white chocolate chips until melted and smooth.
Assemble the Tart: Once your crust is completely cool, pour the blueberry ganache mixture into the tart shell, spreading it evenly.
Chill the Tart: Place the filled tart in the freezer for at least 2 hours, or overnight for a better set. This helps achieve the desired creamy, indulgent texture.