Cut 1-inch (2.5cm) off both ends of the zucchinis and use the spiralizer to make the zucchini noodles. Transfer the zoodles to two serving bowls. Add all the ingredients for the Sauce in a bowl. Whisk to mix well.
Heat up a skillet with the olive oil. Saute the garlic until aromatic. Add the chicken and stir fry until the surface turns white, follow by the Sauce. Stirring continuously until the chicken is completely cooked through and the sauce thickens. Add the scallion, stir to mix well.
Top the zoodles with the chicken, toss to mix well. Garnish with the white sesame and serve immediately.
Notes
Discard any liquid seeping out of the zoodles, if any.