Cook the rice noodles: soak in warm water for 5-10 minutes. Bring a large pot of water to a boil, boil noodles for 1 minute. Drain and rinse, set aside to cool.
Cook the shrimp (if using). Bring a large pot of water to boil. Boil shrimp for 2 minutes. Drain and set aside to cool.
Make the peanut sauce: put the peanut butter in a bowl. Add warm water, 1-2 tbsp at a time, until desired consistency. (I add 6-7tbsp) Add hoisin, lime, sesame, ginger, and mirin. Stir to combine well.
Chop veggies - I like to use romaine, cucumber, and carrot.
Chop/tear herbs - I like to use mint, Thai basil and cilantro. Try to use all 3 if you can!
Serve spring roll bowls with noodles, veggies, herbs, and top with peanut sauce!