In a saucepan over low heat, combine peanut butter, water, fish sauce, light soy sauce, honey, and chili sauce. Stir until everything is smooth and creamy, then turn off the heat.
Cook the penne pasta until al dente, then drain and set aside.
While the pasta cooks, grill the chicken cubes in a grill pan until fully cooked.
Toss the drained pasta with sesame oil to coat evenly.
Pour the peanut dressing over the pasta and toss until well combined.
Finally, mix in the sliced vegetables, grilled chicken, and roasted peanuts. Garnish with freshly chopped coriander or any herbs you like. Serve and enjoy!