Elegant asparagus and Gruyère quiche features fresh spring vegetables in a rich, creamy custard with nutty cheese. This vegetarian, protein-rich brunch dish is perfect for family gatherings.
Preheat the oven to 375°F. Place the oven rack in the lower third to ensure an evenly browned crust.
Trim woody ends from the asparagus and cut the spears into 1-inch pieces; reserve the tips whole for garnish.
In a skillet over medium heat, lightly sauté the asparagus pieces and shallot for 3 minutes until just tender, stirring to prevent browning.
In a large bowl, whisk together eggs, half-and-half, salt, black pepper, and nutmeg until smooth; stir in shredded Gruyère cheese.
Scatter the sautéed vegetables evenly into the pie crust, pour the custard mixture over them, and arrange reserved asparagus tips decoratively on top.
Bake the quiche for 35–40 minutes, until the center is just set and the top is lightly golden. If edges brown too quickly, shield with foil.
Cool the quiche for at least 15 minutes before slicing to allow the filling to set and maintain a clean cut.