Preheat oven to 375 degrees Fahrenheit (190 degrees Celsius).

Melt the butter in a saucepan over medium heat, then whisk in the flour to form a roux. Gradually add the milk and salt, whisking constantly until the mixture thickens slightly. Stir in the spinach, cottage cheese, and nutmeg until well combined.

Lightly grease a 9×13-inch (23×33-centimeter) baking dish and lay four noodles on the bottom. Spread a portion of the spinach mixture over the noodles, then add another layer of noodles. Repeat the layers until all

the ingredients are used, finishing with the spinach mixture on top. Bake, uncovered, for 30 minutes.

Remove the pan from the oven and arrange the Muenster cheese over the top. Return to the oven and bake for another 20–25 minutes, until golden and bubbly.

Let it rest for a few minutes before slicing and serving.