Peanut Butter Banana Pudding

Name: Peanut Butter Banana Pudding
Ingredients: 4 cups (960 ml) whole milk; 1 vanilla bean, split and scraped, or 1 teaspoon vanilla paste; 226 g granulated sugar (8 ounces; 1 cup plus 2 tablespoons); 60 g cornstarch (2 ounces; 6 tablespoons); 3/4 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume; Yolks from 8 large eggs, straight from the fridge (5 ounces; 140 g); 85 g creamy peanut butter (3 ounces; 1/4 cup plus 1 tablespoon), such as Skippy; 16 digestive biscuits (8 1/2 ounces; 240 g), plus more as needed; 5 medium bananas (about 27 1/2 ounces; 775 g), peeled and sliced; 2 cups (480 ml) heavy cream; 1 tablespoon (8 g) powdered sugar; 1/2 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume