Step 1: Prepare the Sauce - Start by combining the low-sodium soy sauce, water, apple vinegar, brown sugar, granulated sugar, minced garlic, and ground ginger in a small bowl. Whisk until well blended, ensuring all sugars dissolve completely for a smooth sauce.
Step 2: Thicken the Sauce - In another small bowl, mix cornstarch with warm water until smooth to form a slurry. Slowly add this mixture into the teriyaki sauce while continuously stirring over medium heat until it thickens slightly; set aside.
Step 3: Sauté Vegetables and Turkey - Heat vegetable oil in a large skillet over medium heat. Add diced onions first and sauté until they become translucent before adding minced garlic followed by ground turkey; cook until turkey is browned thoroughly.
Step 4: Add Veggies - Stir in finely chopped broccoli and grated carrots into the skillet with turkey mixture. Cook everything together until vegetables are tender yet still vibrant in color; this should take about 5 minutes.
Step 5: Combine Sauce and Ingredients - Pour the prepared teriyaki sauce over the turkey and vegetable mixture in the skillet, stirring well to coat everything evenly with that delicious flavor.
Step 6: Serve Over Rice - Finally, serve generous portions of your teriyaki turkey stir-fry over cooked white or brown rice on bowls or plates. Garnish each serving with diced green onions for an added crunch before enjoying!