Caramelized Onion Skillet Quiche

½ (14.1-ounce) package refrigerated or frozen pie dough, thawed if frozen (or 1 homemade pie dough)

3 medium yellow onions

4 tablespoons (½ stick) unsalted butter

1 ½ teaspoons kosher salt, divided

1 teaspoon freshly ground black pepper, divided

¼ cup finely chopped fresh chives

4 ounces Gruyère cheese, finely grated (about 1 cup)

1 ½ cups half-and-half

6 large eggs

2 packed cups baby arugula

Extra-virgin olive oil, for drizzling

Note: Ingredients may have been altered from the original.

Directions at thekitchn.com

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