I buy large Yorkshire puddings from asda, think there like 3 for a £1, Get some chicken breast fry it up, Add gravy and veg, leave to simmer to cook the veg, whack the yorkshire pud in the oven ( Only needs like 5-6 mins ) tip chicken and veg into yorkshire pud.
Maybe add some Mash potato or some roasties and you pretty much have a cheap Sunday roast.