It's been awhile, but I used to go to Costco and buy a package of say, a dozen muffins, 3 or 4 different flavors in one package. The apple muffins were out of this world! I remember they had a bottom layer that was a little crunchy/chewy, maybe it had oats in it or something like that. Anyway, ever since, I've been looking for a recipe that comes close to these, but have not yet been successful. DOes anyone have any recipes or suggestions? Thanks!