I get the feelings the functions in the house might just be getting powered by magic, or at least that's my best guess. Conveniently replaced by magic in an Isekai wouldnt be new but I guess it's a problem that they didn't take a few seconds to explain that. (*if I'm right.)
I am enjoying this manga a lot though, it's nice to have a family struggling to get by with food that's good, but not the best, but is the best to their own family.
It's like when your mum/dad, sis/Bro or grandma/granddad have that one meal that you just can't get enough of that brings you do much comfort even though a store or restaurant could obviously do it better. Like that nostalgic taste and smell of being little and feeling full and happy.
Home cooking is unique in that quality I think, they've tried to explore that in other food isekais and succeeded so it's heartening to have one with that as the main focus.
I do kinda want to read more stories about people summoned who weren't supposed to be but there doesn't seem to be a tag for it on novel updates. A shame.
The other cooking Isekai where the dude was accidentally summoned without super special skills like the intended recipients was really fun.