Combine cottage cheese, Parmesan cheese, minced garlic, milk, salt, pepper, and nutritional yeast in a high-speed blender.
Process on high speed for 60 seconds or until the mixture is completely smooth and no grains remain.
Transfer the blended mixture to a large saucepan over low heat.
Heat gently for 4 minutes, stirring constantly, ensuring the sauce does not reach a boil to prevent protein denaturation and curdling.
Adjust consistency with reserved pasta water if necessary before tossing with pasta.