Preheat the oven to 375°F.
In a large bowl, stir together the sour cream, cream of chicken soup, ranch seasoning, salt, and pepper until smooth.
Add the shredded chicken, 1 cup of cheddar cheese, and ½ cup of crumbled bacon. Stir until fully combined.
Spread the chicken mixture evenly into the bottom of a 12-inch oven-safe skillet.
Arrange the frozen tater tots in a single, even layer over the chicken mixture. (You may not need the entire bag; I used about ¾ of the package.)
Bake for 30–35 minutes, or until the filling is bubbling and the tater tots are golden brown and crispy.
Sprinkle the remaining 1 cup of cheddar cheese over the top and return the skillet to the oven. Bake for an additional 5–10 minutes, or until the cheese is melted.
Remove from the oven and top with the remaining crumbled bacon and chopped chives.
Serve warm, with ranch dressing if desired.