Preheat oven to 350 degrees. Cook lasagna noodles according to package directions; drain and rinse.
In a large skillet over medium-high heat cook sausage and onion until browned; drain. Stir in red pepper flakes and garlic. Remove from heat and set aside.
In a large bowl combine eggs, 3 cheeses and basil; mix until well blended. spread a thin layer of sauce in a 13-x9-inck baking pan; top with layer of noodles. Cover noodles with a layer of cheese mixture; sprinkle with some sausage. Add a layer of sauce. Repeat layering with more noodles, cheese mixture, meat and sauce. Top with another layer of noodles and sauce.Spread tomato slices over top.
Cover lasagna with foil; bake for 45 minutes. Uncover; bake until bubbly, about 15 minutes. Let stand for 15 minutes before slicing.
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