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Keto Garlic Mushroom Chicken Casserole served in a dish with garnishes

Keto Garlic Mushroom Chicken Casserole

A creamy, garlicky chicken casserole topped with melted cheese and browned mushrooms, perfect for cozy weeknight dinners while staying keto-friendly.
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Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings: 4 servings
Course: Dinner, Main Course
Cuisine: American, Keto
Calories: 500
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 2 pieces boneless, skinless chicken breasts (about 1 to 1.25 lb total) Trim and optionally pound to even thickness for uniform cooking.
  • 8 oz mushrooms, sliced (cremini or button) Cremini gives more depth.
  • 3-4 cloves garlic, minced Adjust for your taste.
  • 1 cup heavy cream Full-fat keeps the sauce rich and keto-friendly.
  • 1-1.5 cups shredded cheese (mozzarella or cheddar) Cheddar for sharpness, mozzarella for melt.
  • 1-2 tbsp olive oil or butter Butter adds richness.
  • Salt and freshly ground black pepper, to taste
  • 1-2 tsp fresh or dried herbs (thyme or parsley) Use 1 tbsp if fresh.

Method
 

Preparation
  1. Preheat the oven to 375°F (190°C).
  2. Warm 1–2 tablespoons olive oil or butter in a skillet over medium heat.
  3. Add sliced mushrooms and the minced garlic. Sauté, stirring occasionally, until mushrooms are deeply browned and any released liquid has evaporated, about 6–8 minutes. Season with salt and pepper.
  4. Season both sides of the chicken breasts with salt and pepper and place them in a shallow baking dish.
  5. Spoon the sautéed mushroom and garlic mixture evenly over the chicken.
Sauce Preparation
  1. In a bowl, whisk the heavy cream with your chosen herbs.
  2. Stir in most of the shredded cheese, reserving a handful for the top.
  3. Pour this creamy mixture over the chicken and mushrooms.
  4. Sprinkle the remaining cheese over the casserole to form a golden crust.
Baking
  1. Bake for 25–30 minutes, until the chicken reaches an internal temperature of 165°F (74°C) and the sauce is bubbly.
  2. Let the dish rest for 5 minutes before serving.

Notes

For a lighter dairy option, use half-and-half but expect a thinner sauce. Add a splash of chicken broth if you prefer a less rich sauce. For an extra umami boost, finish mushrooms with a small splash of dry white wine while sautéing.