make your own town house chocolate chip cookie dough (recipe of the toll house package) then roll it up like the slice and bake put it in the fridge to firm up let him see the round dough and you slicing it and he"ll think it is store brought,
You might want to check the package of ingredients and compare them to your recipe.
If you cook yours and he doesn't complain then tell him it was your homemade.
also you might want to save a previous wrapper to have it sitting on the counter while you are slicing yours. Mind tricks.
When our daughter was lilttle she would only eat Mcdonalds hamburgers. so I saved a bag and a wrapper, (cleaned then off of course) made supper put hers in the MCd wrapper and the bag. she inhaled the burger and then I told her -she didn't believe me at first so she tried another one of mine and then she said Oh my taste must of grown up!
ok not to insult you or say anything bad. but maybe him telling you the his throat scratches is a way to avoid your cookies, as he doesn't like yours. he is finding a polite way to tell you. so if you use toll house recipe you can't go wrong. goog luck