Step 1: Preheat the Oven. Start by preheating your oven to 350°F (175°C). This ensures your cookies bake evenly.
Step 2: Cream the Butter and Sugars. In a large mixing bowl, cream together the room temperature butter, brown sugar, and sugar until light and fluffy (about 2-3 minutes).
Step 3: Add Wet Ingredients. Mix in the molasses, vanilla extract, and the egg. Beat until well combined.
Step 4: Combine Dry Ingredients. In a separate bowl, whisk together the flour, cocoa powder, and salt. Gradually add to the wet ingredients, stirring until just combined.
Step 5: Fold in the Chocolate. Gently fold in the bittersweet and semisweet chocolate wafers or chips.
Step 6: Scoop the Dough. Using a cookie scoop or spoon, drop rounded tablespoons of dough onto a prepared cookie sheet, leaving space between each one.
Step 7: Bake. Bake for about 10-12 minutes, or until the edges are set but centers remain soft.
Step 8: Cool and Enjoy. Let the cookies cool on the sheet for a few minutes before transferring to a wire rack to cool completely.