Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

Cream together the softened butter, granulated sugar, and brown sugar in a mixing bowl for about 2-3 minutes.

Add the room-temperature egg and vanilla extract to the butter mixture; beat on low until fully incorporated.

In a separate bowl, whisk together the all-purpose flour, baking powder, and salt. Gradually mix this into the wet mixture.

Using a cookie scoop, portion the dough into 7-8 balls and place them on the prepared baking sheet, spacing them 2 inches apart.

Bake for 12-13 minutes until lightly golden around the edges and slightly underbaked in the center.

Allow the cookies to cool on the baking sheet for about 10 minutes before transferring them to a cooling rack.

While cooling, prepare the frosting by beating the softened butter, then gradually add the powdered sugar, butterscotch syrup, vanilla, and heavy cream until smooth.

Once cookies are cool, frost them and sprinkle with Harry Potter-inspired sprinkles.