In the same boat! I have 4 and 2 year old boys who I'm educating at home, so they are with me 24/7! It can be hard cooking for them while fasting, just yesterday I was drooling while helping my younger one to eat his lunch.
One thing fasting days have made me realize is I was getting a substantial portion daily of calories from THEIR food! Nibbling bites here and there, finishing leftovers, etc. I thought I was being careful with my own diet before, but if you include what I ate from their plates, it really adds up and explains why the scale was slowly creeping up.
One benefit of having the kids around is that hopefully they will learn about healthier food choices from us at a young age. Even on non fast days, I'm trying to cut out the junk, eat more fruits and veggies, an ounce or two of almonds for snacks, drink more water, etc. They are aware of all of this, even if they're not eating exactly what I eat yet.
So hopefully the extra struggle for us will be beneficial for our little ones in the long run!
Also, there's no reason why we can't still cook with them-- but healthier choices too! Roasting spicy ginger almonds or whipping up a green smoothie can be just as fun for the kids as baking brownies (although we still do that, of course!)