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1
Fill a 9x13-inch baking dish two-thirds of the way with hot tap water.
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2
Add noodles, and arrange them in alternating directions to prevent sticking.
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3
Let soak while preparing the sauce.
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4
MAKE SAUCE: Heat oil in a large saucepan over medium heat.
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5
Add onion, garlic, Italian seasoning, and red pepper flakes; cook, stirring occasionally, until lightly browned, about 5 minutes.
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6
Add sausage, and cook, stirring and breaking it up, until just cooked through, about 5 minutes.
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7
Add tomatoes, and their puree, breaking up tomatoes with a spoon or your fingers; bring to a boil.
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8
Reduce to rapid simmer, and cook, stirring occasionally until thickened, about 20 minutes.
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9
You should have about 8 cups of sauce.
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10
Season with salt and pepper.
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11
Preheat oven to 350F
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12
Drain noodles, transfer to a baking sheet; dry dish with paper towels.
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13
Spoon 1 cup sauce in bottom of dish.
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14
Fit 4 noodles in dish (crosswise if using short noodles, lengthwise if using long), overlapping slightly.
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15
Cover with 2 cups sauce, 2 cups mozzarella and 1/4 cup Parmesan.
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16
Repeat with another layer, then top with remaining noodles, 3 cups sauce, and the rest of the mozzarella and Parmesan.
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17
Cover dish tightly with aluminum foil, and bake 1 hour.
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18
Remove foil, and continue baking until bubbly and browned, about 30 minutes.
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19
Remove from oven; let cool 20 minutes.
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20
Cut and serve.
