Place empty wok or large skillet over medium-high heat for 2-3 minutes until a drop of water sizzles and evaporates immediately. Then add 2 tablespoons vegetable oil and swirl to coat.
Add broccoli florets and julienned carrots. Stir fry for 3-4 minutes without moving constantly, letting them sit for 30 seconds between stirs to develop slight char.
Add sliced red bell pepper and snap peas. Stir fry for another 2-3 minutes until all vegetables are crisp-tender with vibrant colors.
Push vegetables to the side of the pan. Add minced garlic and ginger to the center and cook for 30 seconds until fragrant but not browned, then mix everything together.
Pour cornstarch slurry (1 tablespoon cornstarch mixed with 2 tablespoons water) and 3 tablespoons soy sauce over vegetables. Toss for 1 minute until sauce thickens and coats evenly. Remove from heat and drizzle with 1 teaspoon sesame oil.