Banana Pudding Parfaits

Ingredients

• 3/4 cup sugar
• 3/8 cup cornstarch
• 1/4 teaspoon salt
• 6 egg yolks
• 3 1/2 cups whole milk
• 2 tablespoons unsalted butter
• 1 tablespoon vanilla extract
• 1 tablespoon dark rum
• 1/2 cup heavy cream (cold)
• 2 tablespoons confectioners' sugar
• 3 1/2 bananas (large, very ripe but not mushy, sliced)
• 1 1/2 boxes cookies (Walkers Pure Butter shortbread, or similar, broken into 1/4-inch pieces)