Preheat your oven to 400 degrees F and line a baking sheet with foil.
To the baking sheet, add the bagels, cut-side up. Spread a little bit of ranch dressing on the bottom and then top with layers of chicken, bacon, and cheese (dividing evenly among the 8 bagel halves).
Place the bagels in the oven and bake for 7-10 minutes or until melty, warm, and toasted. Enjoy immediately, garnished with parsley and sea salt if desired! Serve with extra ranch dressing for dipping on the side.