Meet Britains Custardy Answer to the Oreo and Learn How to Make Your Own

Ingredients

• 170g all-purpose flour (6 ounces; 1 1/3 cups)
• 35g custard powder (1 1/4 ounces; 1/4 cup)
• 1/8 teaspoon Diamond Crystal kosher salt; for table salt, use a pinch
• 113g unsalted butter (4 ounces; 8 tablespoons), softened
• 100g caster or superfine sugar (3 1/2 ounces; 1/2 cup), see notes
• 1 large egg yolk, at room temperature
• 1 teaspoon vanilla paste or extract (see notes)
• 1 tablespoon (15ml) whole milk
• 1 tablespoon (15ml) whole milk
• 18g (2 tablespoons) custard powder
• 70g unsalted butter, softened (2 1/2 ounces; 5 tablespoons)
• 140g confectioners’ sugar (5 ounces; 1 1/4 cups), sifted, plus more as needed
• 1 teaspoon vanilla paste or 1 teaspoon vanilla extract

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