01 - Preheat oven to 425°F. Line a baking sheet with parchment paper or lightly grease the surface.
02 - Combine chicken pieces in a large mixing bowl with olive oil, ranch seasoning mix, garlic powder, paprika, black pepper, and salt. Toss until chicken is uniformly coated.
03 - Distribute coated chicken pieces in a single layer across the prepared baking sheet.
04 - Bake for 15 minutes, turning halfway, until chicken is cooked through and just beginning to brown.
05 - Sprinkle cheddar and mozzarella evenly over the hot chicken pieces.
06 - Return baking sheet to oven and bake for an additional 5 minutes, until cheese is fully melted and bubbly.
07 - Remove from oven. Allow to cool briefly for 2 minutes, then garnish with parsley and green onions if desired. Serve while warm.