Preheat the oven to 425°F (220°C).
If using a baking sheet, lightly grease it or line it with parchment paper.
Roll out the pre-made pizza crust on a lightly floured surface to fit your baking sheet or pizza stone.
Transfer the crust to the prepared baking sheet or stone.
In a mixing bowl, combine the shredded chicken, crumbled bacon, and garlic powder. Add salt and pepper to taste.
Spread the ranch dressing evenly over the pizza crust, leaving a small border around the edges.
Evenly distribute the chicken and bacon mixture over the ranch dressing.
Sprinkle the mozzarella cheese on top of the chicken and bacon mixture.
If desired, add diced tomatoes for extra flavor and color.
Bake in the preheated oven for 12-15 minutes or until the crust is golden and the cheese is bubbly and slightly browned.
Remove from the oven and let cool for a couple of minutes.
Garnish with chopped green onions, slice the pizza with a pizza cutter, and serve hot.