Stir together the garlic, gochujang, soy sauce, monk fruit, and vinegar in a small bowl and set aside.
Heat a large nonstick pan over high heat. When hot, add the avocado oil. When the oil is hot, add the zucchini and cook on hight until lightly blistered, about 4 minutes. Add the reserved gochujang mixture and cook until little to no liquid remains, about 2 minutes. Remove from heat and drizzle with sesame oil. Garnish with toasted sesame seeds, if using.