Preheat oven to 350°F. Bake chicken until no longer pink, 20-30 minutes. Remove and set aside.
STEP 2
Increase oven temperature to 400°F.
STEP 3
Melt butter in a saucepan over medium heat. Stir in garlic, lemon juice, soup, Italian seasoning, half-and-half, and Parmesan.
STEP 4
In a baking dish, layer spinach, then mushrooms. Pour half of the sauce over mushrooms. Place chicken and cover with remaining sauce. Add bacon bits and mozzarella on top.