Preheat oven to 350ºF, spray an 8x8 or 8x11 oven-safe pan with cooking spray.
In a medium-size pot add the heavy cream, half the mozzarella, garlic, Italian seasoning, salt, and pepper. Bring the mixture to a simmer over medium-high heat until all the cheese has melted. Turn off the heat and add in the zucchini, stir until it's well coated.
Pour the zucchini into the oven-safe pan and spread the mixture so it is in a nice even layer.
Sprinkle the remaining mozzarella cheese and parmesan cheese.
Bake for 10-15 minutes until the cheese is golden brown and the zucchini is cooked through.