Melt butter in a pan over medium heat.
Add minced garlic and stir, cooking for 1 minute.
Add flour a tablespoon at a time and whisk in between each tablespoon. Once all flour has been added, whisk thoroughly and cook for 1 minute.
Add plant milk 1/2 cup at a time and whisk in between each 1/2 cup.
Add nutritional yeast, salt, pepper and vinegar.
Taste and adjust for seasoning. Bring to a low boil.
Add vegan parmesan and stir until melted.
If your sauce is too thick, add some more plant milk (in about 1/4 cup increments) until you get the desired consistency.
Final taste and adjust seasoning, then plate up with pasta, vegetables, whatever you want!
ENJOY!