If you're from Long Island, you already know: Crumb cake isn't really cake … it's all about the crumbs. This Mile High Classic Top-Heavy Deli Crumb Cake is motivated by the famous bakery, deli and bagel store crumb cakes that generations of Long Islanders grew up caring ❤ With a buttery cake base and an outrageously thick layer of tender cinnamon crumbs, this dish provides the ideal crumb-to-cake ratio in every bite. It's the ultimate breakfast treat,…