Ingredients
For the cookie dough:
2 cups (250g) all-purpose flour
½ cup (100g) sugar
½ cup (115g) butter, softened
1 egg
1 teaspoon vanilla extract
½ teaspoon baking powder
Pinch of salt
3–4 tablespoons milk (as needed)
For the creamy filling:
1 cup milk
3 tablespoons sugar
2 tablespoons cornstarch
1 teaspoon vanilla extract
1 tablespoon butter
For coating:
½ cup sugar
1 teaspoon cinnamon (optional)
Method
1. Prepare the dough
Beat butter and sugar until light and creamy.
Add egg and vanilla extract, mix well.
Add flour, baking powder, and salt.
Add milk little by little until a soft dough forms.
Cover and rest for 20 minutes.
2. Shape the cookies
Place dough into a piping bag with a star nozzle.
Pipe spiral circles onto a baking tray.
Bake at 180°C (350°F) for 12–15 minutes until golden.
3. Make the cream filling
Mix milk, sugar, and cornstarch in a saucepan.
Cook on medium heat while stirring until thick and creamy.
Add vanilla and butter, then cool.
4. Assemble
Pipe cream filling onto one cookie.
Place another cookie on top like a sandwich.
Sprinkle with sugar or cinnamon.
5. Serve
Enjoy soft, crunchy spiral cookies with a creamy center. 
Yield: About 12–15 sandwich cookies.
