Preheat your oven to 375°F (190°C).
In a medium skillet over medium-high heat, brown the ground beef with the diced onion and minced garlic until the meat is fully cooked and the onions are translucent.
Stir in the tomato puree, dried oregano, sea salt, and black pepper, then let the sauce simmer for 5 minutes to allow the flavors to meld.
While the sauce simmers, place the low-fat cottage cheese in a small blender or food processor and pulse until completely smooth and creamy.
Slice the zucchini into thin, long planks to mimic the shape of lasagna noodles.
In a small oven-safe baking dish, spread a thin layer of the meat sauce on the bottom, followed by the whole wheat lasagna sheet (broken to fit if necessary).
Layer half of the blended cottage cheese, a layer of zucchini planks, and more meat sauce; repeat the layers until all ingredients are used.
Sprinkle the shredded mozzarella cheese evenly over the top layer.
Cover with foil and bake for 20 minutes, then remove the foil and bake for an additional 10 minutes until the cheese is bubbly and golden brown.
Let the lasagna rest for 5 minutes before slicing to allow the layers to set.