Bring a large pot of water to a boil. Cook the vermicelli noodles for 2-4 minutes or according to package directions. Remove from heat, drain, rinse with cold water, and set aside.
While the noodles cook, wash and prepare your veggies. Slice the cucumber, bell pepper, and carrots into matchsticks. Shred some purple cabbage.
Prepare a pan with water deep enough to dip a spring roll wrapper in. Soak one spring roll wrapper for 10-15 seconds in the water bath and place it on a clean cutting board.
Fill the spring roll with a small handful of noodles, a couple of pieces of cucumber, bell pepper, carrot, two basil leaves, and two mint leaves.
Roll up the spring roll by tucking the edges in and folding it over just like a burrito. If your spring roll wrapper is still a little stiff, it will soften as you work with it.
Repeat with all spring roll wrappers and ingredients.
Whisk all the peanut sauce ingredients except for the water in a small bowl. Slowly add water and whisk until it is thinned to the desired consistency.
Cut spring rolls in half if desired and serve with peanut dipping sauce on the side. Store in the fridge for 3-4 days. Do not freeze.