Heat the oven to 400 degrees
Thaw the frozen spinach and squeeze the water out
Chop the onion and scallions and saute them in oil until translucent, about 5 minutes
Chop the garlic and stir it into the pan with the onions for about 1 minute
Add the spinach, salt, pepper and lemon juice and saute for 5 minutes more
Stir in the cheeses and optional heavy cream then cook until hot and bubbly, about 5 minutes
Turn the heat off
With the back of a spoon, make 6 indentations in the spinach and crack an egg into each
Place the skillet into the oven and cook for 8-10 minutes, or until the eggs are cooked to your liking
Serve with toast