Preheat oven to 350 degrees F. Line a baking sheet with parchment paper or Silpat baking mat or parchment paper. Set aside.
In a medium bowl, whisk together flour, baking soda, sea salt, and cocoa. Set aside.
With a mixer, cream butter and sugars together until smooth. Add in eggs, one at a time. Next, add in vanilla extract and mix until combined.
Gradually add flour mixture and beat until just combined. Stir in the chocolate chips and chocolate chunks. Scoop the dough into rounded tablespoons and place on prepared baking sheet, about 2 inches apart. Bake cookies for 8 minutes and remove the baking sheet from the oven. Quickly press the chocolate wafers or big chocolate chunks gently into the tops of the cookies. Place the baking sheet back in the oven and finish baking the cookies for an additional 2 minutes or until the cookies are set around the edges but still soft in the center.
Remove from oven and let sit on baking sheet for 3 minutes. Move to a cooling rack and cool completely.