- Preheat Oven:
- Preheat your oven to 400°F (200°C). Grease a 9×13-inch baking dish and set aside.
- Roast Potatoes:
- In a large bowl, toss the cubed potatoes with olive oil, salt, and pepper. Spread them in an even layer on a baking sheet.
- Roast in the preheated oven for 20-25 minutes, or until the potatoes are tender and golden brown. Stir halfway through cooking for even roasting.
- Steam Broccoli:
- While the potatoes are roasting, steam the broccoli florets until they are bright green and just tender, about 4-5 minutes. Drain and set aside.
Step 2: Make the Cheese Sauce
- Prepare Sauce:
- In a medium saucepan, melt the butter over medium heat. Add the minced garlic and sauté for about 1 minute, until fragrant.
- Whisk in the flour and cook for 1-2 minutes, until the mixture is lightly golden and bubbly.
- Add Liquids:
- Gradually whisk in the milk and chicken broth, ensuring there are no lumps. Cook, stirring constantly, until the sauce begins to thicken, about 5-7 minutes.
- Season Sauce:
- Stir in the Dijon mustard, onion powder, paprika, salt, and pepper. Reduce heat to low and stir in the shredded cheddar and Parmesan cheese until melted and smooth. Remove from heat.
Step 3: Assemble the Casserole
- Combine Ingredients:
- In the prepared baking dish, combine the roasted potatoes, steamed broccoli, and diced or shredded chicken. Pour the cheese sauce over the top and mix gently to combine.
- Add Cheese Topping:
- Sprinkle the shredded cheddar and mozzarella cheese evenly over the top of the casserole.
Step 4: Bake
- Bake Casserole:
- Cover the baking dish with foil and bake in the preheated oven for 20 minutes.
- Remove the foil and bake for an additional 10-15 minutes, or until the casserole is bubbly and the cheese on top is golden brown.
Step 5: Serve
- Cool and Serve:
- Allow the casserole to cool for a few minutes before serving. This helps the sauce to set and makes it easier to serve.
- Garnish with chopped fresh parsley or chives if desired.
Tips for Success:
- Even Cooking: Make sure to cut the potatoes into even-sized cubes for consistent roasting. Stir them halfway through roasting to ensure they cook evenly.
- Use Rotisserie Chicken: For convenience, use a rotisserie chicken. It adds great flavor and saves time.
- Make Ahead: You can prepare the casserole ahead of time by assembling it up to the point of baking, then covering it and refrigerating. When ready to bake, allow it to come to room temperature and bake as directed.
This Baked Potato Chicken and Broccoli Casserole is a delicious and comforting meal that’s sure to be a hit with the whole family. Enjoy the creamy, cheesy goodness with tender chicken, roasted potatoes, and nutritious broccoli in every bite!