Banana Cream Pie With Bourbon Whipped Cream

Name: Banana Cream Pie With Bourbon Whipped Cream
Ingredients: 1¾ cups (210 g) finely crushed graham crackers (about 15); ½ cup (1 stick) unsalted butter, melted, slightly cooled; ¼ cup (50 g) granulated sugar; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt; ¾ cup (150 g) granulated sugar; ½ cup (62 g) all-purpose flour; 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, divided; 2½ cups whole milk; 3 large egg yolks; 4 Tbsp. chilled unsalted butter, cut into ½ pieces; 3 tsp. vanilla extract, divided; 2–3 bananas, sliced ¼ thick; 1 cup heavy cream; ¼ cup (28 g) powdered sugar, sifted; 2 tsp. bourbon (optional); Flaky sea salt (optional); A 9-diameter ceramic or glass deep pie dish