I made 2 batches of marshmallows - one strawberry and one chocolate - and I have a ton left. How long will they last in an airtight container? Can they be frozen? It's just a gelatin/sugar recipe (no egg whites).
I keep homemade batches during the summer (northeast) especially in the frig and freezer, pre-cut and lightly dusted with sweet rice flour. I wrap well in parchment paper and then foil. Keep air out for sure. Mallow picks up other flavors/odors easily.
If we want to make and enjoy marshmallows in the summer and leave them out they will stay in a melty state and be pretty lousy to enjoy. Keeping them cool is the only way to go and they freeze beautifully.
Because I've kept homemade marshmallows for yeeeaaaars and they're still fine (nobody's died yet) . . . and I live in a very hot and humid area. However, I do keep them in a dark pantry and we do have air conditioning.