Heat or prepare tomato sauce; simmer while preparing the filling and boiling the noodles.
Heavily salt (as salty as the sea) a large pot of water and bring to a boil. Add the lasagna noodles and cook per package directions.
While the noodles are boiling, prepare the filling. Heat the olive oil in a large skillet over medium heat. When the oil is hot, add the spinach a handful at a time, tossing with the oil during each addition. Saute just until the leaves have begun to wilt. Drain if needed.
Combine the spinach in a bowl with the ricotta, mozzarella, parmesan, egg, season with salt and pepper, to taste. Mix until well combined.
When the noodles are finished cooking, drain in a colander; set aside allow to cool.
Preheat the oven to 400 degrees F.
Prepare a large casserole dish by spreading a thin layer of sauce on the bottom.
Lay out a few noodles at a time onto a clean workspace. Place a few tablespoons of filling on each noodle; spread to cover the entire length of each noodle from edge to edge. Roll the noodles up and place them in the prepared casserole dish, seam side down. Repeat until all of the filling is gone (there may be some noodles left over, these are "backups" in case any of the others rip during assembly).
Pour the marinara sauce over the prepared lasagna rolls. Spread the sauce over the rolls, keeping the noodles hydrated and soft while baking.
Cover with foil; bake until the cheese has melted and the rolls are warmed, about 40-45 minutes. Serve hot.
Notes
I have fallen in love with a roll of freezer paper! It is a great prep area that cleans up in seconds. Grab a roll at the store when shopping for ingredients to use as a prep area for this recipe!
There may be pasta left over; these are "backups" if any others rip during assembly.
How To Freeze: These spinach lasagna rolls are perfect for emergency lunches. Divide into individual portions by placing two rolls on a sheet of wax paper; wrap and place inside a zip-top freezer bag.
How To Reheat: When needed, remove them from the freezer, place them in the microwave or a preheated oven at 350 degrees F, and heat until warmed. They'll be just as good, if not better than they were the first time.
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