Preheat the oven to 375°F (190°C).

In a large skillet over medium heat, sauté minced garlic until fragrant, about 1-2 minutes. Then add the chicken breast and cook for approximately 5-7 minutes on each side until golden brown and cooked through. Transfer the chicken to a plate to rest briefly.

In the same skillet, add sliced mushrooms and cook for about 4-5 minutes, stirring occasionally until softened. Set aside with the chicken.

Reduce heat to low, return the chicken and mushrooms to the skillet, pour in heavy cream, and add cream cheese. Stir gently for about 3-4 minutes until smooth and creamy.

Mix in shredded cheddar cheese, salt, pepper, and Italian seasoning until well incorporated and the cheese has melted.

Pour the mixture into a pre-prepared casserole dish, spreading it evenly.

Bake in the preheated oven for 20-25 minutes until bubbly and golden.

Remove from oven and allow to cool for about 5-10 minutes before serving.