This Easy Creamy Spinach & Mushroom Chicken Casserole is a comforting, one-pan meal that's perfect for busy weeknights. It's packed with protein, veggies, and creamy goodness that will satisfy the whole family.
Chicken breasts are the lean protein base of this dish, making it hearty and satisfying. Olive oil is used for sautéing, providing a healthy fat and subtle flavor. Onion adds a touch of sweetness and depth, while mushrooms bring an earthy, umami flavor. Spinach not only adds color but also a nutritional punch. Cooked rice makes this casserole filling and helps soak up all the creamy goodness. The cream of mushroom soup and sour cream create a luscious, creamy sauce with a hint of tang. Mozzarella cheese tops it all off, melting to create a bubbly, golden crust. Garlic powder and thyme add a touch of aromatic flavor, with salt and pepper tying everything together.
This dish pairs beautifully with a crisp green salad on the side to balance the richness. If you're feeling indulgent, some garlic bread makes a great accompaniment. A glass of white wine or a light beer complements the flavors nicely.
First, get your oven going by preheating it to 375°F (190°C). While that's warming up, grab a skillet and heat up your olive oil over medium heat. Toss in the diced onion and let it sauté until it turns translucent, which should take about 3–5 minutes. Now, add the sliced mushrooms. Cook these until they start to brown, stirring occasionally to get them evenly cooked.
Next up, stir in the fresh spinach. It will wilt down pretty quickly, so keep an eye on it and give it a stir or two. Once the spinach has wilted, remove the skillet from heat and set it aside.
In a large bowl, mix together the cream of mushroom soup, sour cream, garlic powder, and thyme. This is your creamy base. Once it's all smooth and well combined, add in the cooked rice, your sautéed veggies from the skillet, and the raw chicken pieces. Season everything generously with salt and pepper, then mix thoroughly to ensure each bite will be flavorful.
Transfer this mixture into a greased 9x13 inch baking dish. Spread it out evenly, then sprinkle the shredded mozzarella cheese over the top. Pop it in the oven and bake for 30-35 minutes, or until the chicken is cooked through and the cheese is bubbly and golden. Let it cool for a few minutes before diving in.
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