Start by creaming the softened butter and sugar until light and fluffy. This step is key for that tender texture. Then mix in vanilla extract and fresh orange zest for that citrus aroma.
Gradually add flour, cocoa powder, and salt into the mixture. Mix until a soft dough forms without overworking it. Fold in the dark chocolate chips at the end.
Roll the dough into small balls or shape into a log for slicing. Place them on a lined baking tray with space between each. Slightly flatten each cookie for even baking.
For best results, chill the dough for 20–30 minutes. This helps the cookies hold their shape and enhances flavor. Skipping this step may cause spreading.
Bake in a preheated oven at 350°F (175°C) for 12–15 minutes. The edges should look set while the center remains slightly soft. Let them cool completely before serving.