To not want to give my toddlers fish fingers every day...

[MrMakersFartyParty]

I've always made sure my toddlers eat healthily and never had a problem with it.
Over the last week the youngest ones have been refusing to even try what I put in front of them. They're not ill or teething by the way.
If I put fish fingers and bread and butter in front of them they'll eat it, but I can't do this every day.
I cook everything from scratch and I'm on slimming world, and at the moment I'm throwing away so much food and they're screaming at me that they're hungry... I'm dreading meal times.
My mums told me to just give them nuggets, fish fingers, pizza... Stuff they don't really have but they will definitely eat it. But it makes me so uncomfortable, I want them to go back to eating the same things as the family. Also there's no pattern to it, sometimes they'll eat tuna and sometimes they'll just throw it on the floor, sometimes one will eat fish fingers, the other only the bread.
They are 20 months old twins by the way.
Help I'm worried I'm going to make them picky eaters. Do I give them dessert still if they refuse to try their food? What do I do if they're still hungry?

What’s wrong with fish fingers, nuggets or pizza? As long as they eat a bit of fruit and drink some milk they will be getting enough nuitrients. You can still stick to your diet and make smaller portions just for you to avoid wasting food.

My DS is SPD and (we think) undiagnosed autistic.
He's lived off chicken nuggets, toast and roast potatoes for two years.
All the specialists we work with say that when kids have issues, any food is good for them and won't do any real harm in the long run. (I'm not saying this is your case I'm just saying it because if doctors aren't worried about my son's health, then the likelihood is your kids will still be thriving)
So even if this is just a fussy phase be reassured that you are not harming them for life if they only eat fish fingers! Hopefully it will pass, I know firsthand how hard it is when kids won't eat what you put in front of them.
Vitamins are your friend also!

My daughter went through a six week period around 2.5 not eating at all, refusing at school and at home, just drinking milk - in desperation I called my doctor and they suggested just to take her out to eat - that night dh drove her to McDonald's and she ate. We then built back up.

Totally standard for this age. I give my two year old a selection of food including at least one thing I know he'll definitely eat.

A bit of sneaky psychology can sometimes work. Add some peas and carrots in a separate pot. If they ask if they have to eat them, say, 'No, no. Only eat them if you want to grow big and strong. You don't have to.'