2 pounds boneless, skinless chicken breasts (about 4 medium breasts) or thighs

1 (8-ounce) block cream cheese, softened

1/2 cup sour cream or plain Greek yogurt

1 packet (1 ounce) ranch seasoning mix (or 3 tablespoons homemade)

1 teaspoon garlic powder

1/2 teaspoon onion powder

1/4 teaspoon smoked paprika (optional, for warmth)

1/4 teaspoon black pepper, plus more to taste

1/4 teaspoon kosher salt (adjust if your ranch mix is salty)

1 1/2 cups shredded sharp cheddar cheese, divided

6 slices cooked bacon, crumbled (about 1/2 cup)

2 tablespoons chopped fresh chives or green onions, plus more for garnish

1 tablespoon olive oil (for the baking dish)