01 - Preheat the oven to 400°F. Line a baking dish with parchment paper or lightly grease the surface.
02 - Boil the elbow macaroni in salted water until al dente. Drain thoroughly and set aside.
03 - In a saucepan over medium heat, melt the butter. Stir in flour and cook for 1 minute, whisking constantly. Gradually add milk, whisking until smooth. Simmer for 2–3 minutes until thickened.
04 - Remove the saucepan from heat. Add cheddar, mozzarella, Dijon mustard, garlic powder, salt, and black pepper, stirring until the mixture is smooth. Fold in cooked macaroni and allow to cool slightly.
05 - Arrange turkey cutlets between two sheets of parchment paper. Pound with a meat mallet or rolling pin until each is approximately 1/4 inch thick. Season both sides with salt and pepper.
06 - Place a generous scoop of macaroni and cheese filling on one short end of each turkey cutlet. Roll tightly, securing with toothpicks if necessary. Position seam-side down in the prepared baking dish.
07 - Blend panko breadcrumbs, Parmesan cheese, and melted butter in a mixing bowl. Evenly sprinkle over the assembled turkey rolls.
08 - Bake for 25–30 minutes, until the turkey is cooked through and the coating turns golden. Let rest for 5 minutes. Remove toothpicks, slice, and garnish with parsley before serving if desired.