A great, healthy breakfast!
Preheat oven to 375.
Thaw kale and squeeze as much water out of it as possible. Set aside. Finely chop garlic and onion. In a saute pan, heat oil on medium heat. Cook onion and garlic until onion is translucent. Allow to cool fully. In a bowl, whisk together the eggs, milk, salt, pepper, kale, and cooled onion-garlic mixture.
Brush a casserole dish with oil and put 1/2 the cheese on the bottom. Pour in the egg mixture and top with the remaining cheese. Put in oven and cook until eggs are set and no longer wiggly.