Blend the cottage cheese, ½ cup of Parmesan cheese, butter, garlic, salt, and black pepper in a high-speed blender until smooth and creamy.
Boil a large pot of salted water and cook the linguine until al dente, following the package instructions.
Reserve 1 cup of pasta water before draining the linguine, then return the pasta to the pot.
Pour in the blended sauce along with ½ cup of the reserved pasta water, stirring continuously over low heat until the sauce is warmed through and clings to the pasta, about 3 minutes. Slowly add remaining ½ cup water until desired consistency is reached.
Remove from heat and sprinkle the remaining ½ cup of Parmesan cheese over the top. Garnish with fresh parsley if desired, before serving.