If necessary, cook the bacon according to these easy steps. When cool enough to handle, chop and set aside.
Preheat the oven to 425 degrees F. Peel and cut the potatoes. Place in a large bowl, then toss with the olive oil, garlic powder, onion powder, dill, salt, and cayenne. Coat a large baking sheet with cooking spray, then spread the fries onto the sheet in a single layer. Bake 15 minutes, flip with a spatula, then bake an additional 10 to 15 minutes, until lightly crisp.
While the fries are baking, heat the ranch dip in a small saucepan or microwave-safe bowl, just until warm. Toss with chicken to coat.
Remove fries from oven and top with the chicken, cheddar, mozzarella, and bacon. Return to the oven until the cheese melts, 3 to 5 minutes. Top with chives. Serve immediately.