Preheat your oven to 180°C (350°F). Grease your pie dish with a little butter or non-stick spray to prevent sticking.
Chop your vegetables into small pieces and sauté them in a pan with olive oil over medium heat until just tender and slightly fragrant, about 3 minutes.
In a large mixing bowl, whisk the eggs until they are well combined and slightly frothy. Add the milk or cream, and whisk again to incorporate.
Stir in the shredded cheese, sautéed vegetables, chopped herbs, a pinch of nutmeg, and season with salt and pepper. Mix until evenly distributed.
Pour the mixture into your prepared pie dish, spreading it out evenly with a spatula or spoon. Gently tap the dish on the counter to remove any air bubbles.
Place the dish in the oven and bake for 25 to 30 minutes, or until the edges are golden brown and the center is just set but slightly jiggly when nudged.
Remove from the oven and let the quiche rest on a cooling rack for about 5 minutes. This helps it to set further and makes slicing easier.
Slice into wedges and serve warm or at room temperature, garnished with extra herbs if desired. Enjoy the creamy, savory goodness!