This is essentially frozen spinach, baked, with cheese, with a poached egg on top. Really simple to throw together, and a really healthy meal. If you wanted it as a side dish, you could leave the poached egg off.
Here's what I used:
2 boxes of frozen spinach, thawed, with all the water squeezed out
2 tablespoons butter
2/3 cup chicken stock
a handful of breadcrumbs
a handful of parmesan
I sauteed the squeezed-out spinach in the butter until the butter was absorbed, then added the stock and cooked that until it reduced a little. Add half the cheese, stir, and put the whole thing into a buttered roasting dish. Add the rest of the cheese and breadcrumbs on top, and bake at 375 for 20 minutes or so. Serve hot, with poached egg.