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Preheat the oven to 375°F (190°C).
In a large bowl, combine the sliced zucchini, vegan shredded cheddar cheese, vegan shredded mozzarella cheese, vegan bacon bits, red bell pepper, green bell pepper, red onion, garlic, dairy-free sour cream, vegan mayonnaise, nutritional yeast, basil, oregano, salt, and pepper.
Transfer the mixture to a greased casserole dish.
Bake in the preheated oven for 25-30 minutes or until the zucchini is tender and the top is golden brown.
Serve hot and enjoy!