Prepare the Ingredients: Wash and trim the green beans, slice the red bell pepper, and mince the garlic and ginger. Set everything aside.
Cook the Turkey: In a large skillet or wok, heat the vegetable oil over medium-high heat. Add the ground turkey, season with salt and pepper, and cook until browned, about 5-7 minutes, breaking it apart with a wooden spoon.
Add Aromatics: Stir in the minced garlic and grated ginger, and cook for an additional 1-2 minutes until fragrant.
Stir-Fry the Vegetables: Add the green beans and sliced red bell pepper to the skillet. Stir-fry for about 4-5 minutes until the green beans are tender but still crisp.
Add Sauce: Pour the soy sauce and sesame oil over the stir-fry, mixing well to combine. If you like a thicker sauce, add the cornstarch-water mixture at this stage and stir continuously until the sauce thickens, about 1-2 minutes.
Final Touches: Taste and adjust seasoning with more salt and pepper if needed. Remove from heat.
Serve: Spoon the stir-fry over cooked rice or quinoa and sprinkle sesame seeds on top for garnish.