Blackberry Cream Pie with Toasted Oat and Sesame Crumb Crust

Ingredients

• 1 ¹⁄₂ cups old fashioned rolled oats
• 1 cup plus 2 Tbsp. granulated sugar
• ¹⁄₄ cup sesame seeds
• ³⁄₄ tsp. kosher salt
• 10 tbsp. unsalted butter, melted
• 2 cups whole milk
• ¹⁄₂ vanilla bean, split lengthwise and seeds scraped
• ¹⁄₄ cup cornstarch
• 2 whole eggs plus 2 egg yolks
• 2 cups blackberries, plus halved berries to garnish
• ³⁄₄ cup heavy cream
• 3 tbsp. confectioners' sugar