Bring a large pot of water to a boil and cook the lasagna noodles until al dente, according to package instructions. Drain and set aside.
Heat a skillet over medium-high heat, add the ground beef, and cook until browned and cooked through, about 8 minutes. Drain excess fat.
Stir in taco seasoning and a splash of water, then simmer until the mixture thickens and becomes fragrant, about 3-4 minutes. Turn off heat.
Preheat the oven to 375°F (190°C). Spread a thin layer of salsa in the bottom of a baking dish. Layer cooked noodles over the salsa, then carefully spread half of the seasoned beef over the noodles. Sprinkle with a third of the shredded cheese.
Repeat the layering process: noodles, remaining beef, and cheese. Finish with a final layer of noodles topped with salsa and cheese. Cover with aluminum foil.
Bake in the preheated oven for 30-35 minutes, or until bubbling and the cheese on top is golden brown. Remove from oven and let rest for 5 minutes.
Garnish with chopped lettuce, dollops of sour cream, and additional salsa if desired. Slice and serve hot.
