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1
Preheat oven to 375 degrees F. Coat a 9x13-inch baking dish with olive oil; set aside.
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2
In a large skillet over medium heat, warm 2 tablespoons olive oil. Add onions and cook until soft and translucent, about 5 minutes. Add a pinch chili flakes and sausage and cook, stirring occasionally to break into pieces, until sausage is cooked through and browned.
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3
Add 2 tablespoons butter to the skillet to melt, then stir in the flour until completely combined. Stir in chicken stock and milk, increase heat to bring to a boil, and cook until thickened, about 5 minutes. Season to taste with salt and pepper, then remove from heat and set aside to cool.
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4
Heat 2 tablespoons butter in a large nonstick skillet over medium heat. Add eggs and cook, stirring often, to scramble. Remove from heat and set aside.
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5
To assemble lasagna, spoon 1/2 cup gravy, without sausage pieces, into the bottom of the baking dish and spread to coat. Place 4 lasagna noodles over the bottom of the pan, then top with half of the eggs, half of the spinach, 1/3 of the sausage gravy, 1/2 cup shredded cheddar, 1/2 cup shredded mozzarella and 1/3 of the hashbrowns. Repeat with another layer of noodles, the remaining eggs, remaining spinach, sausage gravy, 1/2 cup shredded cheddar and 1/2 cup shredded mozzarella. Top final layer of noodles with remaining sauce, cheeses and hash browns.
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6
Cover and bake 30 minutes, the uncover and bake 10 minutes more. Let rest 10 minutes before slicing. Garnish with chopped chives to serve.
