Nigella Lawson's Croque Monsieur Bake

I was flipping through my cookbooks the other night and I found a sticky on this recipe. I had completely forgotten about it. I used to make it all the time. I love the fact that you can put it together the night before and then pop it in the oven in the morning. It smells delicious while it's baking and tastes even better. You can change up the meat and cheeses as well. Turkey and swiss is also really yummy.
You can find the recipe on Nigella's website.
Do you have a breakfast recipe that can be made the night before? I've seen a lot of overnight oats on blogs lately. I'm thinking of trying it.