Preheat oven to 350°. Coat three 8x4-in. loaf pans with cooking spray. In a large bowl, beat butter and brown sugar until crumbly, about 2 minutes. Add egg whites, eggs, coffee, yogurt, oil and extracts until blended., In another bowl, whisk flour, cocoa, baking soda and salt; add to brown sugar mixture alternately with buttermilk, beating well after each addition. Fold in chocolate chips., Transfer to prepared pans. Bake until a toothpick inserted in center comes out clean, 50-55 minutes. Cool 10 minutes before removing from pans to wire racks to cool completely., Drizzle melted white baking chocolate over loaves. Sprinkle with crushed candies.