In a large skillet or wok, heat the vegetable oil over medium-high heat.
Add the ground turkey and cook until browned and cooked through, about 5-7 minutes. Break it apart with a spatula as it cooks.
Stir in the minced garlic and ginger, cooking for an additional 1-2 minutes until fragrant.
Add the sliced bell peppers, broccoli florets, and snap peas to the skillet. Stir-fry for about 3-4 minutes until the vegetables are tender-crisp.
Pour the teriyaki sauce over the turkey and vegetables, stirring to coat everything evenly. Cook for another 2-3 minutes until heated through.
Remove from heat and sprinkle with chopped green onions and sesame seeds, if using.
Serve hot over cooked rice or quinoa.