Cream together 1 cup of softened unsalted butter, 1/2 cup of granulated sugar, and 1/2 cup of powdered sugar until light and fluffy.

Add 1 teaspoon of vanilla extract and 2 large eggs, mixing until well incorporated.

In a separate bowl, whisk together 1 cup of unsweetened cocoa powder, 1/2 teaspoon of baking powder, and 1/4 teaspoon of salt.

Gradually fold the dry mixture into the wet ingredients until just combined.

Cover the dough and refrigerate for at least 1 hour.

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

Scoop a tablespoon of chilled dough, place a white chocolate chunk in the center, and roll into a ball.

Bake for 10-12 minutes until edges are set but centers remain soft.

Cool on the baking sheet for 5 minutes before transferring to a wire rack and rolling in powdered sugar.