Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly grease it with cooking spray.
In a large mixing bowl, combine shredded chicken, cream cheese, cheddar, bacon, ranch seasoning, and green onions if using. Stir until everything is well mixed and creamy.
Lay out a tortilla on a flat surface and spread a generous layer of the filling evenly over it. Roll the tortilla up tightly, then slice into 1-inch rounds. Repeat with remaining tortillas.
Arrange the pinwheels on the prepared baking sheet, cut side up. Lightly spray or brush the tops with cooking spray or melted butter to help them brown.
Bake for 12–15 minutes, or until the edges are golden and the cheese is bubbly.
Let cool slightly before serving warm. Garnish with extra green onions or a drizzle of ranch, if desired.