Preheat your oven to 350°F (180°C). Prepare a 9-inch (24 cm) pie dish or oven-safe skillet, and lightly grease it with olive oil.
Dice the onion, garlic, zucchini, and bell pepper. Uniformly sized vegetables are important to ensure even cooking and a visually appealing frittata.
Heat the olive oil in a skillet over medium heat. Sauté the onion for 2-3 minutes until softened. Add the garlic, zucchini, and bell pepper, and sauté for another 5 minutes, until slightly tender. Avoid using leafy greens here, as they can make the quiche too watery.
In a large bowl, whisk together the eggs, heavy cream, grated cheese, salt, pepper, and finely chopped parsley. This mixture will form the body of the frittata-style quiche.
Add the sautéed vegetables to the egg and cream mixture, and stir well to distribute the filling evenly.
Pour the mixture into the prepared dish and spread it evenly. If desired, sprinkle with a little extra cheese on top.
Bake for 30-35 minutes, or until the center is set and the top is golden brown. Check for doneness by inserting a toothpick into the center; it should come out clean.
Let cool for 10 minutes before slicing and serving. Serve warm, lukewarm, or cold – it's excellent for breakfast, lunch, or dinner.
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