Get Ready: Preheat your oven to 400°F (200°C). Lightly grease or line a 12-cup muffin pan.
Combine Wet Ingredients: In a large mixing bowl, whisk together the egg, egg white, brown sugar, honey, Greek yogurt, melted coconut oil, and vanilla extract until smooth. Gently fold in the squeezed-dry zucchini.
Mix Dry Ingredients: In a separate medium bowl, combine the cocoa powder, flour, baking powder, and salt.
Combine All: Gradually add the dry ingredient mixture to the wet ingredients, stirring just until everything is combined. Be careful not to overmix!
Add Chocolate & Bake: Stir in the chocolate chips. Divide the batter evenly among the 12 muffin cups, filling each about two-thirds full. Bake for 20-25 minutes, or until a toothpick inserted into the center of a muffin comes out clean. Let them cool slightly before enjoying!