Giant Spinach Shells

Yield: 6 Servings
Categories: Vegetarian
24Whole giant shells
1tbVegetable oil
110 oz pkg
1smOnion -- minced
2tbButter -- melted
1lbCottage cheese
1Egg -- beaten
1/2tsSalt
1/4tsBlack pepper
30ozTomato sauce
1cMozzarella cheese --
Shredded
Frozen spinach -- chopped
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