1. Preheat oven to 375 degrees. Pour 1 cup of Alfredo sauce in the bottom of a 1.6-quart round baking dish.
  2. Stir together ricotta, egg, garlic and salt in a large bowl. Add spinach and shredded cheeses to bowl and stir until thoroughly combined.
  3. Evenly spread spinach mixture on 8 cooked lasagna noodles. Roll up the lasagna noodles starting on the short end.
  4. Place lasagna rolls vertically in the prepared pan. Bake covered for 30 minutes and uncovered for 5 minutes.
  5. Serve immediately with remaining Alfredo sauce, if desired.