Lighter Hash Brown Quiche

Preheat the oven to 375 °F. Spray a 9-inch round quiche dish or pie plate with cooking spray. Heat the oil in a large nonstick skillet over medium-high heat. Add the onion and mushrooms and cook, stirring occasionally, until tender, 6 to 8 minutes. Add the potatoes and ham and cook, stirring occasionally, until the potatoes are tender, about 10 minutes. Spread the mixture into the prepared dish. Whisk together the milk, eggs, half-and-half, scallions, salt and nutmeg in a large bowl until blended. Stir in the cheese. Pour evenly over the potato mixture. Bake until the top is golden and a knife inserted into the center comes out clean, about 25 minutes.