This cinnamon bread is soft, moist, and layered with a sweet cinnamon swirl before being topped with a buttery cinnamon crunch topping that bakes up perfectly golden. I've found using oil and sour cream together creates an incredibly tender crumb that stays moist for days, while the cinnamon sugar filling gives every slice that cozy, bakery-style flavor I love. Since it's a quick bread, there's no yeast, no rising time, and no complicated steps—just an easy loaf that's perfect for breakfast, an afternoon coffee break, or a late-night snack with a little salted butter.