Cook noodles according to package directions until al dente, then drain and rinse under cold water.
In a small bowl, whisk together peanut butter, soy sauce, rice vinegar or lime juice, honey or maple syrup, minced garlic, and ginger until smooth.
Add water gradually to the dressing until it reaches a smooth, pourable consistency.
Add sriracha or chili flakes to the dressing if desired for heat.
Combine cooked noodles, carrots, cucumber, bell pepper, green onions, and cilantro in a large bowl.
Pour the peanut dressing over the salad and toss to evenly coat all ingredients.
Serve topped with crushed peanuts and lime wedges.