Prep the Spinach: Wash the fresh spinach thoroughly and chop it into bite-sized pieces. Set aside.
Make the Roux: In a medium-sized saucepan, melt butter over medium heat. Add all-purpose flour and stir continuously to create a smooth roux.
Add Milk and Cream: Gradually pour in the whole milk and heavy cream while stirring consistently. Continue cooking until the mixture thickens.
Incorporate Spinach: Add the chopped spinach to the creamy mixture. Stir well, allowing the spinach to wilt and blend with the sauce.
Cheese and Seasoning: Sprinkle in the grated Parmesan cheese, salt, pepper, and a pinch of nutmeg for an extra layer of flavor. Mix until the cheese is fully melted, ensuring all ingredients blend well.
Simmer and Serve: Let the creamed spinach simmer on low heat for a few minutes, ensuring all the flavors meld together. Once the spinach is tender, your dish is ready to serve.