METHOD
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prepare the vegetables
Cut the zucchini and peeled onion into thin slices. Cut the cherry tomatoes into quarters. Place a rack in the middle of the oven and preheat it to 190 °C / 375 °F.
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pan-fry the vegetables
Place an oven-safe 24 cm / 9.5-inch pan over medium heat. Add olive oil, onion, zucchini and sauté for 5 minutes. Add cherry tomatoes and chopped basil. Season with salt and pepper, toss to combine, then cook for 2-3 minutes. Remove from the heat.
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frittata
Add eggs, grated parmesan cheese, salt, pepper, and milk to a large bowl. Using a whisk, beat until well combined. Add the pan-fried vegetables to the pan and mix with the eggs. Pour the mixture back into the pan and place over medium heat. While gently stirring, cook for 2 - 3 minutes, then transfer to the middle rack of the oven. Bake for 15 - 18 minutes at 190 °C / 375 °F or until the center is still slightly jiggly and the edges are set.
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serve
Take the Zucchini and Tomato Frittata from the oven and invert carefully to a large plate. Sprinkle with fresh herbs and arrange halved cherry tomatoes on top. Optionally add some shredded parmesan cheese on top and drizzle with olive oil. Cut into slices and serve.