I'm not sure that not issuing a toast-based supper to a child who didn't eat their dinner - even if they're only 1 - is a terrible thing to do. I don't think supper was even a thing that featured in my childhood - there wasn't a meal just in case you get hungry served just before bed at any point.
If my baby (nearly 1) doesn't eat his dinner, I assume that he's not interested or hungry. I don't go about seeking out something he will eat instead, or fear he'll starve if I don't find something he'll eat for supper later.
He eats more of less of his meals depending on such a range of things. If he refuses everything, he's probably not hungry.
After a certain point, it is possible to tell that they're waiting for the toast supper instead or whatever. I'm not convinced encouraging this is a brilliant thing to do. And, frankly, I don't need to add another bloody meal time to a small child's day.
Nor do I give loads of praise for eating some dinner. I just go with a relaxed meal, maybe talk about how nice the food is as I eat with him, and let him get on with eating it. Or not.
He's the youngest of 3, so I do know that toddlers will just refuse food because ... well because.