Homemade Tim Tams Recipe | Classic Australasian Chocolate Biscuits

Ingredients

• 1 cup (2 sticks) unsalted butter, softened
• 3/4 cup powdered sugar
• 1 large egg yolk
• 1 teaspoon pure vanilla extract
• 1 1/2 cups all-purpose flour
• 1/2 cup Dutch-process cocoa powder
• 1/2 teaspoon fine sea salt
• 1/4 teaspoon instant espresso powder
• 1/2 cup dark chocolate, finely chopped
• 1/2 cup milk chocolate, finely chopped
• 1/2 cup heavy cream
• 2 tablespoons unsalted butter
• 1/2 teaspoon vanilla bean paste
• 12 ounces high-quality dark chocolate (60-70% cacao), for coating
• 1 tablespoon coconut oil