1. Preheat your oven to 350°F (175°C).
2. In a large bowl, cream together the softened butter and brown sugar until light and fluffy.
3. Add the egg and vanilla extract, mixing until well combined.
4. In a separate bowl, whisk together the flour, salt, and baking powder.
5. Gradually add the dry ingredients to the wet mixture, alternating with the milk, until a dough forms.
6. Roll out the dough on a floured surface and cut into desired shapes.
7. Place the cutouts on a baking sheet lined with parchment paper.
8. Fill half of the cutouts with a spoonful of brown sugar filling, then top with another cutout and seal the edges.
9. Bake for 12-15 minutes or until golden brown.
10. Let cool before serving.

Discover my favorite kitchen tools I always use.