1️⃣ Make the Dough: In a mixing bowl, beat softened butter and granulated sugar until light and fluffy. Add the egg and vanilla extract, mixing until combined.

2️⃣ Combine Dry Ingredients: In a separate bowl, whisk together flour, baking powder, and salt. Gradually add to the butter mixture, mixing until a dough forms.

3️⃣ Chill the Dough: Shape the dough into a disc, wrap it in plastic wrap, and refrigerate for 30 minutes to make rolling easier.

4️⃣ Prepare the Filling: In a small bowl, mix brown sugar and cinnamon. Set aside.

5️⃣ Roll & Fill: On a floured surface, roll out the dough into a ¼-inch thick rectangle. Brush with melted butter and sprinkle the cinnamon-sugar mixture evenly over the dough.

6️⃣ Roll & Slice: Carefully roll the dough into a tight log. Wrap in plastic wrap and freeze for 15-20 minutes for easier slicing.

7️⃣ Bake the Cookies: Preheat oven to 350°F (175°C). Slice the dough into ¼-inch thick cookies and place them on a lined baking sheet. Bake for 10-12 minutes or until the edges are lightly golden.

8️⃣ Glaze (Optional): Whisk powdered sugar, milk, and vanilla extract together until smooth. Drizzle over cooled cookies and let set before serving.