Cook lasagna, drain and rinse with hot water.
Meanwhile, preheat oven to 350.
In medium saucepan, over medium heat, combine milk, flour and garlic salt, blend well.
Stir constantly, until boiling and sauce thickens.
Reserve 1/2c white sauce for top.
Stir spinach and onions into remaining sauce.
In bowl, mix cottage cheese and mozzarella.
Spread 1/2c spinach sauce in bottom of 13x9 dish.
Top with 3 noodles, half of cheese mix and half of remaining spinach sauce.
Repeat layers.
Top with last 3 noodles and reserved white sauce.
Sprinkle with parmesan cheese.
Bake at 350 for 30 minutes or until lightly browned.
Let stand 5-10 minutes before serving.
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