Melt the chocolate chips and butter together in a microwave-safe bowl, stirring until smooth. Set aside to cool slightly.
In a separate bowl, whisk together granulated sugar, brown sugar, eggs, and vanilla extract until light and fluffy.
Sift in the flour, baking powder, salt, and cocoa powder. Stir gently to combine, then fold in the melted chocolate mixture until smooth.
Drop spoonfuls of dough onto a lined baking sheet, spacing them apart. Bake at 350°F (175°C) for 10–12 minutes, until the edges are set but the centers remain soft.
Let the cookies cool on the baking sheet for 5 minutes before transferring to a wire rack. Enjoy warm or store for later!