Heat a skillet over medium heat, add the butter, and once melted, toss in the sliced mushrooms. Sauté for a few minutes until they gain a nice color.
Stir in the minced garlic and cook for about 15 seconds until it becomes fragrant.
Remove the skillet from the heat, add the mascarpone cheese, and stir until it melts into a creamy sauce. Allow this mixture to cool slightly.
In a large mixing bowl, combine the shredded chicken, well-drained spinach, grated parmesan cheese, salt, and pepper.
Pour in the heavy cream, half of the mozzarella cheese, and the cooled mushroom-garlic-mascarpone mixture.
Gently mix all the ingredients until they are well combined.
Transfer the mixture into a 9x9 inch casserole baking dish (lightly sprayed with nonstick spray). Sprinkle the remaining mozzarella cheese evenly over the top.
Bake for 30 minutes, or until the cheese is golden and bubbly. Serve warm and enjoy your delicious, healthy meal!
Notes
Nutrition Information (per serving): Calories: 412kcal, Total Carbs: 4g, Net Carbs: 3g, Fats: 33g, Protein: 26g.