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Instructions:
- Preheat the oven to 375°F (190°C) and grease a 9×13-inch baking dish.
- Bring a pot of salted water to a boil and cook the cubed potatoes for 10–12 minutes, just until fork-tender. Drain and set aside.
- Toss the broccoli with olive oil, salt, and black pepper. Roast for 10 minutes until slightly tender.
- In a saucepan over medium heat, melt the butter. Add the garlic and cook for about 30 seconds until fragrant.
- Whisk in the flour and cook for 1 minute to form a roux.
- Slowly whisk in the milk, stirring constantly, until the sauce thickens and becomes smooth.
- Stir in the sour cream, paprika, onion powder, salt, and black pepper.
- Remove from heat and mix in half of the cheddar and mozzarella until melted.
- In a large bowl, combine the potatoes, chicken, broccoli, and cheese sauce.
- Transfer the mixture to the prepared baking dish and sprinkle with the remaining cheese.
- Bake uncovered for 25–30 minutes, until bubbly and golden on top.
- Let rest for 5 minutes before serving. Garnish if desired.
Variations
- Add ranch seasoning to the sauce for classic baked potato flavor.
- Use rotisserie chicken for extra depth and convenience.
- Swap broccoli for cauliflower or mixed vegetables.
- Add jalapeños or pepper jack cheese for a spicy version.
Tips
- Do not overcook the potatoes; they should be tender but hold their shape.
- Roasting the broccoli prevents excess moisture in the casserole.
- Use freshly shredded cheese for the smoothest, creamiest sauce.
- This casserole reheats well and tastes even better the next day.