In a large pot of boiling water, add the rice noodles and cook according to package instructions until al dente. Drain and rinse under cold water to prevent sticking.
In a medium bowl, whisk together the peanut butter, soy sauce, sriracha, honey, rice vinegar, and 1/2 cup of water until smooth. Adjust the water using more if you prefer a thinner sauce.
In a large skillet, heat sesame oil over medium heat. Add sliced red bell pepper, snap peas, and shredded carrots. Sauté for about 5 minutes until the veggies are tender-crisp.
Add the drained noodles to the skillet with the sautéed vegetables. Pour the spicy peanut sauce over the noodles, tossing everything together to ensure an even coating. Cook for another 2-3 minutes until heated through.
Remove from heat and garnish with chopped green onions, crushed peanuts, and fresh cilantro.