Creating a Croque Monsieur is straightforward if you follow these easy steps:

1. Prepare Béchamel Sauce: If making homemade béchamel, melt 2 tablespoons of butter in a saucepan over medium heat. Add 2 tablespoons of all-purpose flour and stir for 1-2 minutes. Gradually whisk in 1 cup of milk, cooking until thickened. Season with salt and pepper to taste.

2. Preheat Oven: Preheat your oven to 400°F (200°C) to ensure it’s ready for baking.

3. Prepare Bread: Lay out the slices of bread on a clean surface. Spread butter on one side of each slice.

4. Assemble Sandwiches: Place a slice of ham and a slice of cheese on the unbuttered side of four slices of bread. Top with additional cheese if desired, then place another slice of bread on top, buttered side facing out.

5. Toast the Sandwiches: In a skillet over medium heat, place the sandwiches and toast for 2-3 minutes on each side until golden brown.

6. Add Béchamel Sauce: Once toasted, place the sandwiches on a baking sheet. Pour béchamel sauce generously over each sandwich, ensuring they are well-covered.

7. Bake: Place the baking sheet in the preheated oven and bake for 10-12 minutes, or until the cheese is bubbly and golden.

8. Serve: Remove from the oven and let cool for a couple of minutes. Garnish with fresh parsley if desired before slicing.

These simple steps will guide you in creating an incredible Croque Monsieur that is sure to impress.