Cook the rice noodles by boiling water in a large pot. Add the rice noodles and prepare according to package instructions, usually about 4-6 minutes. Drain and rinse under cold water. Set aside to cool.
In a medium mixing bowl, combine the creamy peanut butter, sesame oil, soy sauce, sriracha, honey, rice vinegar, minced garlic, and grated ginger. Whisk until smooth and creamy, adding warm water if needed.
In a large mixing bowl, add the cooled rice noodles and pour the peanut sauce over them. Toss gently until the noodles are evenly coated.
Incorporate the sliced red bell pepper and shredded carrots into the noodle mixture, stirring gently to combine.
Serve at room temperature or slightly warm, garnished with reserved scallion greens, chopped cilantro, and sesame seeds. Adjust heat with additional sriracha if desired.
Notes
Adjust the sriracha to taste for desired spiciness.