Rinse the shrimp under cold water and pat dry with paper towels. Season with a pinch of salt and pepper.
Wash and trim asparagus, slice red bell pepper, and rinse snap peas. Mince garlic and ginger.
In a small bowl, combine soy sauce, oyster sauce (if using), cornstarch, and water. Whisk until smooth.
Heat a large skillet or wok over medium-high heat. Add vegetable oil and swirl to coat the pan.
Add minced garlic and ginger to the pan. Stir-fry for about 30 seconds until fragrant.
Add the shrimp in a single layer. Cook for about 2–3 minutes until pink, then flip for another minute until opaque.
In the same pan, add asparagus and red bell pepper. Stir-fry for about 2–3 minutes until they start to soften.
Add snap peas and stir-fry for another couple of minutes until everything is tender yet crisp.
Return the cooked shrimp and sauce mixture to the pan. Stir well to coat all ingredients evenly.
Let everything cook together for an additional minute or two until the sauce thickens.
Remove from heat and serve over warm rice or noodles. Garnish with sesame seeds and green onions.