Follow these simple steps to create a delightful Zucchini and Feta Frittata:

1. Preheat the Oven: Preheat your oven to 375°F (190°C) to prepare for baking the frittata.
2. Sauté Vegetables: In an oven-safe skillet, heat the olive oil over medium heat. Add the diced onion and sauté for 3-4 minutes or until it becomes translucent. Add the minced garlic and grated zucchini, cooking for an additional 2-3 minutes until the zucchini softens slightly.
3. Prepare Egg Mixture: In a separate bowl, whisk together the eggs, dried oregano, salt, and black pepper until fully blended.
4. Combine Ingredients: Pour the egg mixture over the sautéed vegetables in the skillet. Gently stir to distribute the zucchini and onion evenly.
5. Add Feta: Sprinkle the crumbled feta cheese evenly over the top of the egg mixture, pressing it down gently.
6. Cook on the Stove: Cook on the stovetop for about 3-4 minutes until the edges begin to set.
7. Bake the Frittata: Transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the frittata is puffed and a toothpick inserted in the center comes out clean.
8. Cool and Slice: Once done, remove from the oven and let it cool for a few minutes. Slice into wedges for serving.

These straightforward steps will guide you in mastering the art of creating a fabulous Zucchini and Feta Frittata without any fuss.