In a blender, combine gochujang, soy sauce, liquid sweetener, and silken tofu. Blend until creamy.
In a pan, add sesame oil and saute minced garlic over medium heat for 30 seconds. Add in the onion and saute for 3 minutes. Add in the mushrooms and cook everything for another 3-5 minutes.
Add in the udon noodles and saute for 1 minute. Pour in the cream sauce and toss until the noodles are completely coated. Place a pan on the lid and bring the noodles and sauce to a simmer.
Add parmesan cheese (if using) and toss again.
Top the noodles with parsley and additional parmesan cheese and enjoy!
