Bring a large pot of lightly salted water to a boil. Cook lasagne sheets in boiling water for 8 to 10 minutes or until al dente; drain.
In a large frypan over medium heat, saute beef mince, onions, salt and garlic salt until meat is brown. Drain excess fat, add pasta sauce to beef mixture and bring to a boil. Reduce heat and simmer for 15 to 20 minutes.
Preheat oven to 180 degrees C. Grease a 20x30cm glass baking dish.
Line bottom of dish with three lasagne sheets. Spread 1/3 of sauce mixture over lasagne sheets. Layer 1/3 of the cottage cheese over the sauce. Sprinkle 1/3 of the mozzarella over the cottage cheese. Repeat this layering process until all ingredients are used up.
Bake in the preheated oven for one hour. Let stand for 10 minutes before serving.