Heat the oven: Preheat to 400°F (200°C). Lightly grease a 9x13-inch baking dish with olive oil or butter.
Prep the chicken: Pat chicken dry and season with a pinch of salt, pepper, and half the ranch seasoning.
This helps lock in flavor from the start.
Blanch or steam the broccoli: For crisp-tender bites, steam fresh florets for 2–3 minutes until bright green. If using frozen, make sure they’re thawed and well-drained to avoid watery sauce.
Mix the sauce: In a bowl, combine sour cream (or Greek yogurt), remaining ranch seasoning, milk or broth, garlic, onion powder, and paprika. Stir until smooth.
Taste and adjust salt and pepper.
Assemble the dish: Add chicken and broccoli to the baking dish. Pour the ranch sauce over the top and toss gently to coat everything evenly.
Add the cheese: Sprinkle shredded cheese evenly over the sauced chicken and broccoli. If using the crunchy topping, mix crumbs with melted butter and scatter over the cheese.
Bake: Cover loosely with foil and bake for 15 minutes.
Remove foil and bake another 10–15 minutes, until the chicken is cooked through (internal temp 165°F/74°C) and the cheese is melted and bubbly.
Finish and rest: Let the dish rest for 5 minutes before serving. This helps the sauce thicken and flavors settle.
Serve: Spoon into bowls as-is, or serve over rice, quinoa, mashed potatoes, or buttered noodles for an extra-comforting meal.