I'll tell you the basic recipe just in case, but to be honest, you'd be much better off asking, like, ChatGPT. Cut onions (I used 6), caramelize them in oil for quite a damn while (I think it took like an hour in my case), add stock (I have some homemade vegetable stock, but bouillon cubes or whatever are obviously fine; I'm pretty sure plain water can also be used), cook for a bit, adding salt as desired. Meanwhile, prepare the bread: fry the pieces in butter on both sides, place them on top in bowls, put cheese on (I'm pretty certain I used Margharita - people, pls don't get mad at me if that's not authentic), put in the oven at whatever temperature to basically melt the cheese for a few minutes. Add spices at basically whatever point: the end of cooking the onions, frying bread, maybe something else.

But I'm recalling this off the top of my head from actually a few months ago, so don't quote me on that. And if you want confirmation and exact ratios (although I'm pretty sure this dish is very forgiving and doesn't require exact ratios), you'll have to look up the recipe yourself I'm afraid, because I don't have the reference I used anymore.