Whisk all the ingredients together for the Kung Pao sauce in a small bowl until combined. Set aside.
Cook noodles al dente according to package instructions. Strain, drizzle with a bit of oil and toss to combine. Set aside until ready to use.
While the noodles are being prepared, heat 1 tablespoon oil in a large sautÃ© pan or wok over medium-high heat. Season chicken evenly with a few pinches of salt and pepper, then add it to the pan. Cook for 3-4 minutes, stirring occasionally, until the chicken is cooked through. Transfer the chicken to a clean plate with a slotted spoon and set aside.
Add the remaining 1 tablespoon oil to the pan, along with the onion and mushrooms. SautÃ© for 4 minutes, stirring occasionally, until soft. Add the zucchini and garlic and sautÃ© for 2 more minutes, stirring occasionally.
Stir in the Kung Pao Sauce, cooked chicken and rice noodles and toss until everything is evenly combined. Cook for 1 more minute until it comes to a simmer.
Remove from heat and serve immediately, garnished with the peanuts, green onions and sesame seeds.