Boil pasta water and cook pasta as per package instructions.
Meanwhile, add pumpkin purée, coconut milk, vegetable stock and white beans to a high speed blender or food processor. Blend until smooth.
Add sauce to a large saucepan over medium heat. Add minced garlic, nutritional yeast, thyme, rosemary, sage, salt and pepper. Bring to a low boil, then reduce heat to low. Cook at low heat for 10 minutes, stirring occasionally.
Once pasta is cooked, add into sauce and stir to combine. Stir in lemon juice and red pepper flakes, serve and enjoy!