Combine the whisked eggs, sugar, salt, milk, and flour until a smooth batter forms. Stir in the melted butter and warm water and make 5-7 crepes from the batter.
Heat some olive oil in a pan over medium heat and briefly sauté the onion and garlic. Add the spinach, season with salt and nutmeg, and sauté for 5-10 minutes. Let the spinach mixture cool before folding in the cream cheese. Spread the creamed spinach over the crepes, roll up the crepes, and place them in a casserole dish.
Melt the butter in a saucepan over medium heat, stir in the flour, and gradually pour in the milk. Bring the sauce to a boil while stirring constantly and once it's the right consistency, pour it over the creamed spinach crepe rolls in the casserole dish.
Garnish the creamed spinach crepe casserole with diced salami and shredded mozzarella cheese, transfer the casserole dish to a preheated oven, and cook at 350°F for 25 minutes. Sprinkle parsley on top before serving.
