Rich bacon, caramelized shallots, and nutty Gruyère cheese bake into this classic Bacon and Gruyère Quiche, perfect for breakfast, brunch, or meal prep.
Preheat your oven to 375°F. Heat a cast iron skillet or other oven-safe skillet over medium-high heat.
Chop the bacon into small pieces and add it to the skillet. Cook for 5-7 minutes, stirring occasionally, until the bacon is crispy. Transfer the bacon to a paper towel-lined plate and pour off all but about 1 tablespoon of the bacon grease.
While the bacon cooks, finely dice the shallot and grate the Gruyère cheese.
Add the shallot to the skillet with the reserved bacon grease and sauté for 3-4 minutes, stirring occasionally, until softened. Remove the skillet from the heat, leaving the shallots in the pan.
In a large bowl, whisk together the eggs, half and half, salt, cayenne, and nutmeg until well combined.
Stir in half of the cooked bacon and half of the shredded Gruyère cheese.
Pour the egg mixture into the skillet over the sautéed shallots. Sprinkle the remaining bacon and Gruyère evenly over the top, then bake according to the remaining recipe instructions.