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1
Preheat oven to 375 degrees. Lightly oil a 9-x-13-inch gratin or baking dish.
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2
In a separate pot, bring water to a boil and add 1/2 teaspoon of salt, broccoli and garlic. Simmer the broccoli and garlic for 5 minutes, until softened. With a slotted spoon remove the broccoli and garlic to a large bowl. Bring the water back to the boil, add the pasta, and cook the pasta for about 2 minutes less than the package directions suggest, about 11 minutes. The pasta should be al dente, a little firm.
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3
Meanwhile, in a large Dutch oven set over medium-high heat, heat the oil. Add sausage and the garlic cloves from the broccoli bowl, and cook, stirring frequently until meat is fully cooked and no longer pink, about 4 to 5 minutes, if using fresh sausage. (If using fully cooked sausage, cook until surface is golden, about 2 to 3 minutes.) With a slotted spoon, transfer sausage to the broccoli, and drain most of the oil from the pan, leaving about 2 tablespoons. Discard the garlic.
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4
Toss drained pasta with sausage mixture. Add beans, stock, 3/4 cup of grated mozzarella cheese and all of the ricotta. Add remaining salt and pepper. Gently toss. Transfer to prepared gratin or baking dish, top with breadcrumbs, remaining 1/4 cup of grated cheese and 1/4 cup mozzarella cheese, and drizzle with olive oil.
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5
If making this in advance, allow the mixture to come to room temperature, cover with plastic wrap and place in the refrigerator.
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6
Bake for 25 minutes, until heated through and crusty on top.
