Main course (lunch) for 20

[Lysianthus]

Please could I have suggestions! It's for a lunch club for seniors, so I need to avoid curries/spice etc and I can't use onions.
I've exhausted the sausages, cottage pies and roast ham, so looking for ideas which I can prepare at home and which won't cost the earth. TIA.

Thank you again to the latest posters, brilliant ideas, loving the creamy chicken, and you're all right, I can use the oven with the right dishes. I'm going to write all this up so I have it to hand. You're all wonderful. And still no onions

Does it have to be warm food?

I'd be very tempted with those numbers/limited oven space/ no spice etc to go for a really decent ploughman's lunch.

@Overthinkingperhaps a really good idea, particularly as it warms up outside. Roll on the Summer!

Toad in the hole
Soup and sandwiches
Lancashire hot pot
Rabbit stew
Some sort of pie with chips