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Heat oven to 375 degrees.
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Boil potatoes 10 minutes; drain and let cool.
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Shred or mash them and mix in minced onion plus salt and pepper to taste.
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Press into a buttered 9 inch pie pan; bake 30 minutes.
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Separate cauliflower into florets.
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Steam 10 minutes, then remove half the florets and set aside.
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Steam the rest another 15-20 minutes them mash them in a bowl.
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Heat butter in skillet; add onions and garlic and sauté until tender.
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Mix in basil, mashed cauliflower, and salt and pepper to taste.
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Saute another minute. Remove from heat and stir in egg. Spread this mixture in the crust.
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Sprinkle cheese over cauliflower mixture.
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Distribute partially steamed cauliflower florets on top. Bake 30-35 minutes.