Creating Savory Zucchini Casserole can be straightforward if you follow these steps:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C).
2. Prepare Zucchini: In a large skillet, heat olive oil over medium heat. Add chopped onions and minced garlic, sautéing until translucent.
3. Cook Zucchini: Add the sliced zucchinis to the skillet. Cook until they are tender, about 5-7 minutes. Stir occasionally.
4. Mix Ingredients: In a large bowl, combine the sautéed zucchini mixture, shredded cheddar cheese, sour cream, eggs, salt, black pepper, and oregano. Stir until well mixed.
5. Add Breadcrumbs: Gently fold in the breadcrumbs, ensuring they are evenly distributed throughout the mixture.
6. Transfer to Baking Dish: Grease a 9×13-inch baking dish and pour the mixture into the dish, spreading it evenly.
7. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes, or until the top is golden brown and the casserole is set.
8. Cool: Remove from the oven and let it cool for 5-10 minutes before slicing.
9. Garnish: Sprinkle chopped parsley on top for a fresh touch before serving.

By following these steps, you will create a delicious Savory Zucchini Casserole that is sure to impress!