Ingredients:
- 16 large eggs
- 1 1/4 cups heavy cream
- 1 1/2 teaspoons kosher salt plus more
- 3/4 teaspoon freshly ground black pepper plus more
- 5 tablespoons unsalted butter, divided
- 12 ounces fresh breakfast sausage links
- 2 cups sliced leeks, white and green parts only
- 2 russet potatoes (1 1/2 lb.), peeled, shredded, and lightly squeezed
- 1 pound frozen spinach, thawed, squeezed dry, roughly chopped
- 1 1/2 cups (4 oz.) grated Gruyère
- 1/2 cup (1 1/2 oz.) grated Parmesan
