Yeah absolutely a crumbly muffin is terrible and it all comes down to the recipe. Muffins need to hold together and be moist. As far as cupcakes go, believe it or not Homebrand vanilla packet mix with a thin layer of slightly soft icing is really good. The Homebrand mix has a really fine texture, still airy and light but just the air bubbles inside the cake are really small, which creates a soft but a nice cake that holds together really well.