Creating Keto Garlic Mushroom Chicken Casserole is simple when you follow these clear steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C). This ensures it’s hot enough to cook the casserole evenly.
2. Prepare the Chicken: Season the chicken breasts with salt and pepper. In a large skillet over medium heat, add olive oil. Cook the chicken for about 5-7 minutes on each side, or until golden brown and cooked through. Remove from the skillet and set aside.
3. Sauté the Mushrooms: In the same skillet, add the sliced mushrooms and sauté for about 5 minutes until they are browned and tender. Add minced garlic, thyme, and oregano. Continue to cook for an additional 2-3 minutes, stirring frequently.
4. Make the Sauce: Lower the heat and pour in the heavy cream. Stir well to combine and let it simmer for about 3-4 minutes. Add in the mozzarella cheese and half of the Parmesan cheese, stirring until melted and creamy.
5. Combine Chicken and Sauce: Slice the cooked chicken breasts and place them in a greased casserole dish. Pour the mushroom and cream sauce over the chicken, ensuring even coverage.
6. Add Cheese Topping: Sprinkle the remaining Parmesan cheese on top of the casserole for a cheesy crust.
7. Bake the Casserole: Place the casserole in the preheated oven and bake for 30-35 minutes, or until the cheese is bubbly and slightly golden.
8. Garnish: Once baked, remove from the oven and let it cool for a few minutes. Garnish with fresh parsley before serving for an added touch of flavor and color.

With these straightforward steps, you’ll have a delicious Keto Garlic Mushroom Chicken Casserole ready to enjoy!