Lasagna Roll Ups

I make this recipe so often that I have to include it on my own blog with my minor modifications. I originally saw the recipe here and they're so easy to make and flash freeze individually instead of making a whole lasagna...I love it!
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Filling:
1/2 pound ground beef or ground turkey, cooked with grease drained
6 T. Parmesan cheese, shredded or grated
3 c. ricotta cheese (I use low fat or part-skim)
1 c. frozen spinach, defrosted and drained
1 - 12 oz. package shredded mozzarella cheese (I use part skim)
3 whole eggs + 2 egg whites (or 4 whole eggs)
1 1/2 t. salt
1/4 t. pepper
1/2 t. Italian seasoning
(+ additional mozzarella to sprinkle on top for baking)
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Cook and drain 1 box of lasagna noodles according to package instructions. Lay noodles individually on a flat surface and spread 3 heaping teaspoons of filling mixture on each noodle. Starting from one end, slowly roll the noodle.
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To freeze: Line 2 cookie sheets with waxed paper. Place roll ups on the waxed paper about an inch apart. Freeze completely before storing in a Ziplock bag. No need to defrost before baking...grab the number of roll ups you want to feed your family and cook as directed below.
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To cook: Place roll ups side-by-side into a casserole dish. Cover with marinara sauce and sprinkle with additional mozzarella and/or Parmesan cheese. Cover with foil and bake on 375 degrees for 40 minutes. Remove foil and brown cheese an additional 5-10 minutes.