Apple Custard Pie with Hazelnut Streusel - Diamond Nuts

Ingredients

• 2 cups all-purpose flour
• 1/4 cup granulated sugar
• 1/2 teaspoon baking powder
• 3/4 teaspoon kosher salt
• 2 sticks cold unsalted butter, cubed (2 sticks = 1 cup)
• 1/4 cup cold water
• 5 large apples
• 4 tablespoons unsalted butter
• 1/2 cup brown sugar
• 1 tablespoon dark rum
• 2 teaspoons ground cinnamon
• pinch kosher salt
• 1 cup heavy cream
• 1/2 cup sour cream (full-fat)
• 3/4 cup granulated sugar
• 1 teaspoon vanilla bean paste
• 4 large egg yolks
• 1/4 cup all-purpose flour, sifted
• 1/2 cup all-purpose flour
• 1/3 cup brown sugar
• 2/3 cup Diamond of California® Chopped Hazelnuts
• 1/4 cup butter, softened
• 1 cup heavy whipping cream
• 1/4 cup powdered sugar, sifted plus
• 1 tablespoon powdered sugar
• 1/2 teaspoon vanilla extract
• 1/4 teaspoon ground cinnamon
• 1 tablespoon whiskey