Preheat oven to 350 degrees. Spray a casserole dish with nonstick cooking spray and set aside.
Cook lasagna noodles according to the package instructions. Rinse with cold water and lay flat on nonstick foil or parchment paper.
8 lasagna noodles {not the no boil kind}
In a heavy bottomed pot, melt the butter over medium heat. Whisk in flour and cook for one minute.
4 Tbsp butter, 4 Tbsp flour
Whisk in chicken broth, milk and Dijon mustard. Bring to slow boil and whisk until thickened, about 3-5 minutes. Remove from heat and stir in Jarlsberg cheese.
2 cups milk, 2 cups vegetable or chicken broth, 4 Tbsp Dijon mustard, 2 cups shredded Jarlsberg cheese
Ladle 1/2 cup of cheese sauce into the bottom of the prepared pan.
Reserve 1/4 cup of shredded Swiss cheese and 1/4 cup of spinach.
Divide the turkey, remaining spinach and Swiss cheese among each lasagna noodle. Roll up into a pinwheel shape and place on top of the sauce in the prepared dish. Top with reserved spinach. Ladle a spoonful of sauce on top of each roll and top with reserved shredded cheese.
1 10 oz box of frozen chopped spinach, 2 cups leftover turkey, 2 cups shredded Swiss cheese
Bake, covered with foil, for 15 minutes. Remove foil and bake for another 5 minutes.