Quickly steaming asparagus in the microwave keeps it bright green and prevents it from becoming mushy in the quiche. For another simple flavor boost, look for feta seasoned with Mediterranean herbs.
Preheat oven to 375°F. Set out pie crust to thaw for 10 to 20 minutes.
Place asparagus in a microwave-safe dish and add 1/4 inch water. Cover tightly and microwave on High until crisp-tender and bright green, about 2 minutes; drain. Transfer to the pie crust and sprinkle with feta.
Whisk eggs, milk, salt and pepper in a medium bowl. Pour over the asparagus and feta in the crust.
Set the quiche on a baking sheet and bake until the center is set, 35 to 40 minutes. Let stand for 10 minutes before slicing.