Creating Chicken Cordon Bleu Stromboli is easy with these clear step-by-step instructions:

1. Preheat the Oven: Begin by preheating your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Cook the Chicken: Season the chicken breasts with salt, pepper, and Italian seasoning. In a skillet, heat olive oil over medium heat. Cook the chicken for 5-7 minutes on each side until fully cooked. Remove from the skillet and let it cool, then shred it.
3. Prepare the Filling: In a large bowl, combine the shredded chicken, diced ham, and shredded Swiss cheese. Mix in the Dijon mustard until the ingredients are well coated.
4. Roll Out the Dough: Unroll the refrigerated pizza dough onto a lightly floured surface. Stretch it into a rectangular shape, about 12×16 inches.
5. Layer the Filling: Spread the chicken, ham, and cheese mixture evenly over the pizza dough, leaving a border of about one inch around the edges.
6. Roll the Stromboli: Starting from one end, carefully roll the dough over the filling, tucking the edges in as you go. Pinch the seams to seal the stromboli securely.
7. Prepare for Baking: Place the rolled stromboli seam-side down on the prepared baking sheet. Whisk the egg in a small bowl and brush it over the top of the dough to achieve a golden crust.
8. Bake: Bake in the preheated oven for 30-35 minutes, or until the stromboli is golden brown and cooked through.
9. Cool and Slice: Remove from the oven and let the stromboli cool for a few minutes before slicing. This helps maintain the filling inside.
10. Garnish: Before serving, garnish with freshly chopped parsley for a touch of color and flavor.

With these steps, you’ll have a delectable Chicken Cordon Bleu Stromboli ready to impress your family and friends.