green tea shortbread sandwiches

INGREDIENTS

• 2 cups flour
• 1/2 teaspoon salt
• 1/2 cup powdered sugar
• 3 tablespoons unsweetened green tea powder (matcha)
• 2 sticks (1 cup) unsalted butter, softened
• 1/2 teaspoon almond extract
• Superfine sugar, for sprinkling (optional)
• 4 ounces white chocolate, chopping into very small pieces
• 3 to 4 tablespoons heavy cream