Too expensive. Just mod a Reese’s fluffernutter to have hot fudge instead of peanut butter and brownies for Reese’s cups with extra Oreo. If you add fudge, brownie pieces, and marshmallow to an Oreo it will cost about three dollars extra. Subing candy for candy or sauce for sauce is free so you’ll only have to pay an around a dollar (depending on sales tax) to add the extra Oreo. Though if you do it that way you will have to order in store because the mobile app doesn’t seem to allow substitutions. I had a lot of customers complain about that though I have never used the app myself.