Preheat your oven to 375°F (190°C) and grease a medium baking dish with olive oil.

In a large mixing bowl, combine sour cream, mayonnaise, minced garlic, salt, black pepper, and chopped parsley. Stir until smooth.

Slice the zucchini into thin rounds, about ¼ inch thick. Toss slices in the creamy mixture until fully coated.

Transfer the zucchini mixture into the greased baking dish, spreading evenly across the bottom.

Sprinkle mozzarella cheese over the zucchini mixture, followed by a lighter sprinkle of Parmesan cheese.

Bake for 25-30 minutes until the zucchini is tender and the cheese is golden-brown.

Let the bake cool for a few minutes before serving. Garnish with additional fresh parsley if desired.