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1
In a large pot, cook sausage over medium-high heat, breaking up as it cooks with a spatula.
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2
Cook until it is no longer pink.
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3
Drain off fat.
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4
Add onions, garlic and basil and cook for another 5 minutes to soften onions.
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5
Add mushrooms and cook until liquid is evaporated, about 5 minutes.
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6
Add tomatoes, tomato paste and pepper; bring to a boil.
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7
Reduce heat and simmer for about 15 minutes until most of liquid is evaporated.
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8
Stir in spinach.
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9
Meanwhile, for topping: in saucepan, melt butter over medium heat.
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10
Whisk in the flour and cook, whisking constantly for 1 minute.
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11
Whisk in the milk.
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12
Cook, whisking constantly for 12 to 15 minutes until sauce is thickened.
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13
Add mozzarella cheese, salt and pepper.
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14
Meanwhile, for noodles: cook spaghetti in large pot of boiling salted water for 5 minutes or until tender but firm.
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15
Drain and add to MEAT sauce; toss to coat.
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16
Spread in 2 greased 8-inch square glass baking dishes (this is what original recipe says, but not adequate--try 2 9 x 13-inch pans instead); pour topping over and then sprinkle with Parmesan cheese.
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17
Bake in 375Fu00b0 oven for 30 to 40 minutes or until bubbly and golden.