These keep really well frozen and reheat great. You can easily sub regular all purpose flour or any other gluten free AP mix, but I can't say if they will be as good since I haven't tried them with other GF mixes and I personally don't care for the mixes made from bean flours If you can't find arrowroot starch ( which I think thickens better than cornstarch and you use less) you can always sub with cornstarch If you cant find Meyer lemons, regular lemons work just as great This pancake recipe is my go-to recipe you can add in any fruit or nut combo you like, one of my faves besides these is banana slices and walnuts.