Prepare all ingredients: shred the cooked chicken and slice the zucchini into thin rounds or half-moons using a chef's knife on a cutting board. Mince the garlic cloves.
2 cups shredded cooked chicken
Heat a large skillet or wok over medium-high heat and add 1 tablespoon of olive oil. Swirl to coat the surface evenly.
2 cups shredded cooked chicken
Add the minced garlic to the hot skillet and sauté for about 30 seconds, until fragrant and slightly golden.
2 cups shredded cooked chicken
Add the sliced zucchini to the skillet and cook, stirring frequently, until they begin to soften and turn slightly translucent, about 3-4 minutes. Season with salt and black pepper.
2 cups shredded cooked chicken
Stir in the shredded chicken, spreading it evenly across the pan. Cook for another 3-4 minutes, allowing the chicken to reheat and develop a light sear while the zucchini maintains some crispness.
2 cups shredded cooked chicken
Once everything is heated through and slightly browned, remove from heat. Serve the stir-fry hot, garnished if desired.