Preheat oven to 350 F. Melt butter in a saucepan over low heat. Stir in cocoa and set aside. Combine next 3 ingredients in a bowl. Add butter mixture, flour, cinnamon, and chopped pecans, stirring just until blended. Place paper baking cups in muffin pans, and coat the cups lightly with cooking spray. Spoon muffin batter into cups, filling each 2/3 full. Sprinkle each muffin with a few chocolate chips. Bake 20 minutes or until done. Remove from pans immediately.
This recipe serves 10 people. Because this recipe is for a particular size pan, it adjusts the number of servings only in multiples of 10.