Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or grease lightly with olive oil.
Lightly dust your work surface with flour. Roll out the pizza dough into a rectangle about 1/4 inch thick.
Spread ranch dressing evenly over the dough, leaving a small border around the edges. Sprinkle diced chicken and chopped bacon evenly over the ranch dressing. Add mozzarella cheese and optional green onions.
Starting from a long edge, roll the dough into a tight log. Pinch the seams and ends to fully seal.
Place the stromboli seam-side down on the baking sheet. Lightly brush the top with olive oil, sprinkle with Parmesan cheese, and cut a few slits in the top for steam.
Bake in the preheated oven for 20-25 minutes, until the crust is golden and the cheese is bubbly.
Let the stromboli rest for a few minutes, then slice and serve warm.
Notes
For a crispier crust, bake on a pizza stone if available.