Preheat the oven. Set your oven to 375°F (190°C).
Lightly grease a small baking dish (about 8x8 inches or similar).
Soften the cream cheese. Leave it at room temperature for 20–30 minutes, or microwave in short bursts until just soft. This helps everything mix smoothly.
Mix the base. In a large bowl, add cream cheese, sour cream, and BBQ sauce. Stir until creamy.
Taste and adjust the BBQ sauce to your preferred sweetness and tang.
Season it. Add garlic powder, onion powder, smoked paprika, a pinch of salt, and black pepper. Stir to combine. You want a bold flavor at this stage.
Add the cheeses. Mix in 1 cup of shredded cheddar and the mozzarella or Monterey Jack.
Reserve the remaining cheddar for topping.
Fold in the chicken. Stir in the shredded chicken and about half the sliced green onions. If using mix-ins like jalapeños or bacon, fold them in now.
Transfer and top. Spread the mixture evenly in your baking dish. Sprinkle the remaining cheddar on top for that golden finish.
Bake until bubbly. Bake for 18–22 minutes, or until hot and bubbling around the edges.
If you like a browned top, broil for 1–2 minutes at the end. Watch closely.
Finish and serve. Let it rest for 5 minutes. Scatter the remaining green onions on top.
Serve warm with chips, veggies, or toasted bread.