Preheat the Oven:

• Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone baking mat.

Melt the Chocolate:

• In a heatproof bowl, melt the dark chocolate (semi-sweet or dark chocolate chips) in the microwave in 20-second intervals, stirring after each interval until smooth and fully melted. Set aside to cool slightly.

Mix Dry Ingredients:

• In a large bowl, whisk together the cocoa powder, powdered sugar, brown sugar, and salt.

Combine Wet Ingredients:

• In another bowl, beat the eggs and vanilla extract together. Add the melted dark chocolate to the egg mixture and stir until fully combined.

Combine Wet and Dry:

• Add the wet ingredients to the dry ingredients and stir to form a thick, sticky dough. Be sure not to overmix.

Add the Chocolate Chips:

• Fold in the milk and white chocolate chips. The dough should be thick and studded with chunks of chocolate.

Shape the Cookies:

• Using a spoon or cookie scoop, scoop about 1-2 tablespoons of dough and drop them onto the prepared baking sheet, spacing the cookies about 2 inches apart. Press down lightly to flatten the tops of the cookies slightly.

Bake:

• Bake the cookies in the preheated oven for 8-10 minutes, or until the edges are set, and the tops are slightly cracked. The centers should still be soft and gooey.

Cool:

• Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.