It could be a few different things! If you substituted a lower fat milk for the whole milk, those tend to separate easier. It could also be that maybe your oven is actually a bit hotter than the temp says. Even something as simple has the ph in your milk being a little lower or higher can throw things off.

I’m just spit balling

Cut the potatoes as instructed.

Saute onions and garlic in the cooking oil then add the ham

Wisk six eggs, 1.5 cups milk, seasons and small cheese

Yes, same for me. :)

We haven’t tried freezing this one yet!

Definitely let us know how it goes!