| Preheat oven to 425°F |
| Fit the crust into a 9-in pie pan and crimp the edge |
| 1 (9-in) refrigerated pie crust | line with foil and weights, bake 425°F 10 min | remove weights, bake 5 min more until dry; lower oven to 325°F | scatter into crust | pour over | bake 325°F 35 to 40 min, until just set in the center | rest 10 min |
| 8 slices bacon | fry until crisp, 8 to 10 min, crumble | cook in 2 Tbsp drippings until soft, 5 min |
| 1 small onion, finely chopped |
| 1 1/2 cups Swiss or Gruyère cheese, shredded |
| 3 large eggs | whisk |
| 1 1/2 cups half-and-half |
| 1/2 tsp salt |
| 1/4 tsp black pepper |
| pinch ground nutmeg |