Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish.

Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally, until tender yet firm to the bite, about 8 minutes. Drain.

Mix bread crumbs and melted butter together in a small bowl.

Transfer drained macaroni to the prepared baking dish. Add cottage cheese, Cheddar, sour cream, Parmesan, salt, and pepper; stir until well combined. Sprinkle bread crumb mixture over top.

Bake in the preheated oven until golden brown on top, 30 to 35 minutes.