Step 1

Set a baking sheet on the middle oven rack; preheat to 425 degrees F. Scatter the ham and cheese in the pie crust. Whisk the eggs, half-and-half, chives, 1/2 teaspoon salt and a few grinds of pepper in a large bowl; pour into the crust. Transfer to the hot baking sheet and bake until the eggs are set and the top is lightly browned, about 30 minutes.

Step 2

Meanwhile, whisk the vinegar and mustard in a large bowl. Gradually whisk in the olive oil until smooth. Add the greens and mushrooms; toss well to coat. Season with salt and pepper. Cut the quiche into wedges and serve with the salad.