Been thinking about the 'favourite' question. If on my own, I think I would give a nod to Xmas, and have a ready-meal, they'd be fine. [any snooty folk putting down Waitrose or especially M&S food-halls should think again!]. For a pud, assuming I thought ahead, I'd have some ice-cream, probably rum & raisin or pistachio flavour, not Xmassy but I just like them.
For a snack later, I think I'd delve back to my childhood, and have a fried-egg sandwich; it was a favourite after I saw my dad have one, and I was able to share. Best if you can keep the yolk intact to bite into, just have tissues ready?!
And to get into the Xmas spirit, I recall when young that my parents always had a big bowl of nuts, walnuts, brazils, etc, with a panic every year to find the nutcrackers, but those nuts didn't get eaten for weeks later, when my dad would announce they're not going to waste, so there'd be a major nutcracking session to use them up. Now, my feeble hands these days can barely crack a broad bean, but I WOULD recreate the nuts at Xmas thing, I'd have a giant bag (or some smaller ones) of Cashews, maybe roast peanuts, and certainly pistachios. I'd tell myself they'd be to offer if someone did come round, but actually I'd be dipping into them on a regular basis?!
Oh, yes, chocolates, another Xmas thing, but I can't eat many now, too sickly, so I'd indulge by getting a Fry's chocolate cream, (I'm sure they don't do the 5 fruity flavours now?), or possibly a Turkish Delight (they're only tiny these days!). I'd try to make them last a couple of days?!!