Preheat your oven to 350°F (175°C) so it’s nice and hot when you’re ready to bake.
In a medium bowl, whisk together the all-purpose flour, baking soda, sea salt, and cocoa powder until fully combined. Set this mixture aside.
In a large mixing bowl, beat the unsalted butter, granulated sugar, and light brown sugar together using an electric mixer on medium speed until the mixture is fluffy and light in color, about 2-3 minutes.
Add the eggs one at a time, mixing well after each addition. Then, stir in the vanilla extract until everything is well incorporated.
Gradually add the dry mixture to the wet ingredients, mixing on low speed until just combined. Be careful not to overmix.
Gently fold in the chocolate chips and chocolate chunks with a spatula, ensuring they are evenly distributed throughout the cookie dough.
Using a cookie scoop, drop tablespoon-sized portions of dough onto the prepared baking sheets, spacing them about 2 inches apart. Press a few chocolate baking wafers or big chocolate chunks on top of each cookie for an extra chocolatey touch.
Before baking, sprinkle a pinch of sea salt flakes on top of each cookie. This adds a wonderful contrast to the sweetness.
Bake in the preheated oven for 10-12 minutes, or until the edges are set but the centers are still soft. Remember, they will continue to cook a bit after being removed from the oven.
Allow the cookies to cool on the baking sheet for about 5 minutes before transferring them to a cooling rack. Enjoy them warm or at room temperature!