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1
Preheat oven to 350 degrees F (175 degrees C). Line a large baking sheet with aluminum foil. Grease a 2-quart and a 1 1/2-quart round glass baking dish each with 3/4 teaspoon olive oil; drizzle 1 tablespoon of remaining olive oil into bottom of each baking dish.
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2
Bring a large pot of lightly salted water to a boil. Cook macaroni, ziti, farfalle, and radiatore pasta in the boiling water, stirring occasionally until cooked through but firm to the bite, 8 to 10 minutes. Drain.
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3
Arrange sausage slices on foil-lined baking sheet.
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4
Bake sausage in the preheated oven until browned and crisp, 30 to 45 minutes. Lower oven heat to 325 degrees F (165 degrees C).
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5
Beat eggs in a large bowl until foamy, using an electric mixer. Add Pecorino-Romano cheese, salt, and black pepper; continue to beat egg mixture with electric mixer on highest speed until eggs and cheese are blended, 2 to 3 minutes. Stir cooked pasta into eggs and cheese; mixture should be runny and look like pasta is floating in egg mixture. Stir additional beaten eggs and Pecorino-Romano cheese into mixture if more egg mixture is needed.
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6
Ladle spoonfuls of egg-pasta mixture into each casserole, followed by a layer of sausage; continue layering pasta mixture and sausage until all sausage has been used. Top casseroles with final layer of pasta mixture. Drizzle top of each casserole with 1 tablespoon olive oil. Small pieces of pasta should stick out of the egg mixture.
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7
Bake in the oven until casseroles are set in the center, about 1 hour; raise oven heat to 350 degrees F (175 degrees C) and continue baking until the tops of casseroles are browned and crispy, 1 to 1 1/2 more hours.
