Add 1/8 cup of water to a large pot over medium heat. Add in the sliced onions and cook until translucent, about 3 to 5 minutes.
If you are using lentil or bean pasta, cook it per the directions on the box and add the pasta in at the end. If you are using whole grain pasta, add the pasta in at the beginning of the recipe, uncooked.
In a pot, add mushrooms, broth, nutritional yeast, and black pepper (possibly pasta ).
Bring to a boil over high heat, then reduce to medium-low and let simmer for 10-15 minutes, stirring occasionally to ensure nothing sticks to the bottom
Turn off heat, then stir in the nut butter and lemon juice. Incorporate well.
Add salt as desired.
Top with freshly chopped parsley and black pepper and enjoy!