Marble crunch muffins are a delightful fusion of flavors and textures, combining the richness of chocolate with the lightness of vanilla in a beautifully swirled, marbled pattern. Each bite reveals a balance of sweet, slightly bitter cocoa and creamy vanilla, enhanced by a satisfyingly crunchy topping—often made with a sprinkle of sugar, nuts, or streusel. The muffins are moist and tender inside, with a light, airy crumb