If using a pizza stone, place it in the oven. Preheat the oven to 475ºF. (If you are using a pizza stone, you want to make sure the oven preheats for at least 30 minutes.)
In a large skillet, melt the butter. Add the flour and whisk for 1 minute. Slowly add in the cream and whisk until it is slightly thickened. Season with a bit of freshly grated nutmeg, and salt and pepper to taste. Add the spinach, one handful at a time, stirring until the spinach is wilted.
Divide the pizza dough into 4 equal portions. Stretch or roll the dough into 4 individual sized pizzas. (Mine were about 6 inches in diameter.) Divide the creamed spinach between the 4 pizzas, spreading it to about 1/4-inch of the edges. Sprinkle each pizza with the mozzarella. Press the middles down just a little bit, making a small indentation.
Transfer the pizzas to the oven. (I baked mine 2 at a time, as that is what would fit on my pizza stone.) Crack an egg and gently pour into the indentation on top of each pizza, repeating with all 4 eggs and 4 pizzas.
Cook until the crust is browned, the cheese is melted, and the egg is set but the yolk still runny, 10-12 minutes.
Notes
You may need to bake 2 pizzas at a time, depending on the size of your pizza stone.If you do not have a baking stone, you can cook the pizzas on a baking sheet. You will not need to preheat the oven as long.I like to crack the eggs into small individual bowls, then use the bowls the pour the egg onto the pizza. It’s much easier than having to carefully break an egg directly over the pizza.Nutrition information provided as an estimate only. Various brands and products can change the counts. Any nutritional information should be used as a general guide.