1. In a blender combine milk, cottage cheese, onion, parmesan cheese, salt and pepper; cover and process until smooth. Pour in a bowl; stir in macaroni and 1/4 cup cheese.
2. Transfer to a 1 quart baking dish coated with nonstick cooking spray. Sprinkle with remaining cheese.
3. Cover and bake at 350°F for 30 minutes. Uncover, bake 5-10 minutes longer until edges are bubbly.