Preheat your oven to 350°F. Grease a loaf pan with butter or nonstick spray.

In a medium bowl, mix ground chicken, onion, garlic, egg, Dijon, parmesan, parsley, salt, pepper, and 1/4 cup breadcrumbs using your hands until well combined.

On a piece of parchment or wax paper, flatten the chicken mixture into an 8×12-inch rectangle.

Layer ham slices over the meat, then top with Swiss cheese slices.

Using the parchment to help, gently roll the meat into a log from the short end. Transfer to the loaf pan, seam-side down, and remove the paper.

Mix the remaining breadcrumbs with melted butter and a pinch of salt. Sprinkle over the top.

Bake for about 75 minutes, or until the internal temperature reaches 165°F.

Let the meatloaf rest while you make the sauce.

For the sauce, melt butter in a saucepan over medium heat. Whisk in flour and cook for 1 minute. Slowly whisk in milk and cook until thickened (about 3 minutes).

Stir in Dijon and parmesan until melted and smooth. Season with salt and pepper.

Slice meatloaf and serve with warm sauce spooned over the top. Enjoy!