1. Add stock to medium saucepot and bring to a boil.
Add pasta, stir and cover. Reduce to a simmer and cook 12-15 minutes. Keep covered and stir occasionally.
Place tomato vodka pasta sauce, cottage cheese, and melted butter in high-speed blender. Blend until smooth (about 2 minutes).
Remove pasta from heat. Do not drain. Pour sauce over pasta and stir to combine. Season with salt and pepper. Let sit 2-3 minutes to thicken before serving.