Defrost spinach and Preheat oven to 350°F
Prepare 9x12 casserole dish and pour 1 ½ cup pasta sauce on the bottom.
Bring a large pot of water to a boil. Salt the water with 1 teaspoon of salt and 2 tblsp of oil. Place the Lasagna pasta in the boiling water and let cook for 8 minutes until al dente. With tongs place each pasta strip onto a paper towel so pasta will dry and wont stick together.
Slice mushrooms and dice the onion. In a medium pan saute until both mushrooms and onions are soft. Add minced garlic and saute until the garlic is fragrant about 2 minutes. Set aside
Squeeze all of the liquid out of your thawed spinach place into a large bowl.
Combine sauteed mushrooms, all the cheeses, thawed spinach, egg. And season with salt and pepper and mix until combined
On the pasta strip place 2 tablespoon of filling and roll up. Place seam side down into prepared casserole dish and repeat with remaining filling and pasta strips.
Ladle remaining sauce over each rollup and top with cheese
Cover with foil and bake for 40 minutes or until cheese melts
