Heat oven to 375 degrees. Spray baking dish with non-stick cooking spray (or olive oil)
Cook Lasagna noodles until pliable. Do not fully cook. Strain and set aside individually on preparation table so that they do not stick together. You can also spray with cooking spray (olive oiif you want to ensure they do not stick together or to the table.
Drain excess water from Ricotta cheese. Thoroughly squeeze out water from thawed spinach.
In a bowl, whisk egg. Combine with Ricotta Cheese. Add, spinach, pepper and nutmeg. Mix thoroughly.
Place 1/3 to 1/2 cup filling on each of the lasagna noodles and spread evenly. Beginning at one end, roll-up the noodle. Place seam-side down in oiled baking dish. Repeat until the desired number of noodles are made.
Cover roll-ups with Basic Tomato Sauce. Cover baking dish with aluminum foil. Bake 40-45 minutes or until cheese is melted throughout.
Top with mozzarella cheese. Cook another 10 minutes. Enjoy!