Preheat your oven to 375 degrees F (190 degrees C). Lightly grease a 9×13 inch baking dish.
Cook lasagna noodles according to package directions until al dente. Drain and set aside.
In a medium bowl, combine the cottage cheese, squeezed dry spinach, egg, Parmesan cheese, basil, salt, and pepper. Mix well.
Spread about 1 cup of meat sauce on the bottom of the prepared baking dish.
Arrange four cooked lasagna noodles over the sauce, slightly overlapping if necessary.
Spread half of the cottage cheese mixture evenly over the noodles.
Sprinkle one-third of the mozzarella cheese over the cottage cheese layer.
Spoon about 1 1/2 cups of sauce over the mozzarella.
Repeat the layers: noodles, remaining cottage cheese mixture, one-third of the mozzarella, and another layer of sauce.
Top with the final layer of noodles, the remaining sauce, and the remaining mozzarella cheese.
Cover the dish tightly with aluminum foil.
Bake for 25 minutes. Remove the foil and bake for an additional 20 to 25 minutes, or until the cheese is melted and bubbly and the lasagna is heated through.
Let the lasagna rest for 10 minutes before slicing and serving.
Notes
Squeezing the moisture from the thawed spinach is important to prevent a watery lasagna.
You can substitute ground beef or Italian sausage cooked with your favorite sauce for the jarred sauce for a meat version.
For a lower-carb option, you can use oven-ready noodles, but check your sauce amount as they absorb more liquid.