Blueberry Cream Pie

• 5 blueberried (fresh)
• 3 egg yolks
• 1 filling
• 280 gr vanilla wafer crumbs
• 180 gr granulated sugar
• 38 gr butter
• 8 gr granulated sugar
• 6 gr vanilla extract
• 4 gr confectioners sugar
• 3 gr cornstarch