Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a mixing bowl, cream together butter, brown sugar, and granulated sugar until light and fluffy.
Add eggs and vanilla extract, mixing until combined.
In a separate bowl, whisk together flour, cocoa powder, baking soda, and salt.
Gradually add dry ingredients to wet ingredients, mixing until combined.
Fold in all three types of chocolate chips.
Scoop cookie dough onto the baking sheet using a cookie scoop or tablespoon.
Bake for 10–12 minutes until cookies are set around the edges but still soft in the center.
Allow cookies to cool on the sheet for 5 minutes before transferring to a wire rack.
