1. Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.

2. In a microwave-safe bowl, melt chocolate chips and butter together in 30-second intervals until smooth. Let cool slightly.

3. In a large bowl, whisk together brown sugar, granulated sugar, eggs, and vanilla until combined.

4. Pour in melted chocolate mixture and stir until smooth.

5. In a separate bowl, whisk together flour, cocoa powder, baking soda, and salt.

6. Gradually fold dry ingredients into wet ingredients until just combined.

7. Scoop 2 tablespoons of dough and flatten slightly. Place a few chocolate chips or chunks in the center, then cover with another small piece of dough, sealing edges to form a ball.

8. Place dough balls 2 inches apart on the baking sheet.

9. Bake for 9–11 minutes, until edges are set but centers are still soft.

10. Cool on pan for 5 minutes before serving warm for maximum gooeyness.