Preheat oven to 350°. Cook noodles according to package directions. Meanwhile, in a large skillet, cook beef over medium heat until no longer pink; drain. Stir in taco seasoning. In a small bowl, combine egg whites and ricotta cheese. Drain noodles.
In each of two 13x9-in. baking dishes, layer 4 noodles, 2/3 cup ricotta mixture, half the beef mixture and 1-1/3 cups cheddar cheese. Top each with 4 noodles, 2/3 cup ricotta mixture, 1-1/3 cups salsa and 1-1/3 cups cheese. For final layer, top each with 4 noodles, 2/3 cup ricotta mixture, 1-1/3 cups salsa and 1-1/3 cups cheese.
Bake, uncovered, 35-40 minutes or until heated through. Let stand for 10 minutes before cutting. Freeze option: Cover and freeze unbaked lasagna. To use, partially thaw in refrigerator overnight. Remove from refrigerator 30 minutes before baking. Bake lasagna as directed, increasing time as necessary to heat through and for a thermometer to read 165°.