Preheat the oven to 375°F (190°C).
On a lightly floured surface, roll out the pizza dough into a rectangle.
Spread the ranch dressing evenly over the dough, leaving a small border around the edges.
Layer the mozzarella cheese, bacon, chicken, and red onion over the dressing.
Roll up the dough tightly from one long side, pinching the seams to seal.
Place the roll seam side down on a baking sheet lined with parchment paper.
Brush the top with beaten egg and make small cuts across the top to allow steam to escape.
Bake for 25-30 minutes, or until golden brown.
Let cool for 5 minutes before slicing. Garnish with chopped parsley.
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