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1
Preheat oven to 350 degrees F.
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2
Cook the manicotti in a large pot of boiling salted water until slightly softened, but still firm if eaten. Be careful not to let them get too soft or it makes stuffing them very difficult.
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3
Heat a large pan over medium heat.
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4
Saute the ground beef and onion in olive oil.
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5
Remove from the heat and let cool.
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6
Brush a small amount of oil over a large baking sheet and Place the firmly cooked manicotti on it to cool.
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7
Meanwhile combine the ricotta, 1 1/2-2 cups of mozzarella cheese, 1/2 cup of Parmesan.
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8
Add the minced garlic, salt & pepper to taste, and mix.
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9
Stir the cooled meat mixture with the cheese mixture.
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10
Brush another small amount of oil over a 13 by 9 glass baking dish.
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11
Spoon 1 1/2 cups of the spaghetti sauce over the bottom of the prepared dish.
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12
Fill the manicotti with the cheese and meat mixture, being careful not to break the noodles.
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13
Arrange the stuffed pasta in a single layer in the dish and spoon the remaining sauce over the manicotti.
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14
Sprinkle the rest of the mozzarella and the parmesan cheese over the pasta.
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15
Place the small butter pieces all over the dish.
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16
Bake the stuffed manicotti uncovered until heated through. The sauce will bubble on the sides of the dish, takes around 35 minutes.
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17
Let the manicotti stand for about 5 minutes.
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18
Serve.