Here's my experience with my mother-in-law. I think it might help you!
I have the same problem at my mother-in-law's house. She's a FABULOUS cook and baker. Everything she makes is so good I want to eat the whole bowl of everything! I went up to her several years ago when I began my weight loss journey and told her what I just told you. I explained that I would LOVE to just eat and eat and eat, but to get to my personal weight loss goal I just CAN'T! I told her that I would eat from a dessert plate and have a small portion of everything. I would eat S-L-O-W-L-Y (a HUGE feat for me!) and enjoy every mouthful! I would be paying attention to the great family conversation and actually HEARING what everyone was saying. I also would be STAYING within my calorie limits! She hugged me and thanked me for complimenting her food. Things have been great ever since! I periodically need to remind her about my new portion sizes, but I know that since I am eating EVERYTHING (just in smaller portions), she is not offended.
I have found that there is ALWAYS a way around a problem. You just have to keep your eye on your ultimate goal (losing the weight).