Heat oil in a skillet and cook onion until just barely soft, about 5 minutes. Combine onion and kale and stir in beaten eggs. Add cheeses and stir, then season with salt, pepper, and nutmeg and stir once more time.
Pour into a greased 8 x 8 inch glass baking dish, cover with foil, and bake at 375 degrees until set, about 45 minutes. Let cool slightly before slicing and serving.
Notes
Kale is quite a bitter green. You can remove some of the bitterness by boiling it slightly longer before squeezing dry and chopping, but if you prefer a more mild green, use spinach or Swiss chard in its place.
Recipe by Cooking With MicheleĀ® at https://cookingwithmichele.com/2011/07/kale-harvest-crustless-cheesy-kale-pie/