Millionaire Shortbread Recipe: How to Make It

Ingredients

• 1 cup unsalted butter, softened
• 1/3 cup sugar
• 1-1/2 teaspoons vanilla extract
• 1 large egg yolk, room temperature
• 2 cups all-purpose flour
• 1/2 teaspoon salt
• CARAMEL FILLING:
• 1 cup packed brown sugar
• 3/4 cup unsalted butter, cubed
• 1/4 cup light corn syrup
• 1 teaspoon vanilla extract
• 1/4 teaspoon salt
• 1 can (14 ounces) sweetened condensed milk
• TOPPING:
• 1-1/2 cups 60% cacao bittersweet chocolate baking chips
• 2/3 cup heavy whipping cream
• Flaked sea salt, optional