Prep all vegetables before cooking. Have everything cut and ready.
Mix all sauce ingredients in small bowl. Stir until cornstarch dissolves.
Heat wok or large skillet over high heat until very hot.
Add vegetable oil. Swirl to coat.
Add carrots. Stir-fry 2 minutes.
Add asparagus and bell peppers. Stir-fry 2 to 3 minutes.
Add snap peas and green onions. Stir-fry 1 to 2 minutes.
Push vegetables to sides. Make well in center.
Pour sauce into center. Let bubble 30 seconds.
Toss everything together. Cook 1 more minute.
Remove from heat immediately.
Sprinkle with sesame seeds. Serve hot.