This coffee cake is what happens when your morning brew decides to dress up. Deep mocha flavor and toasted hazelnuts run through a tender, buttery crumb, all crowned with a cocoa-spiced streusel that bakes up rich and irresistible. A light vanilla glaze drizzled over the top seals the deal, making every slice feel like a cozy café treat—perfect for slow mornings, afternoon coffee breaks, or sneaking just one more piece before anyone notices.