Start by bringing a large pot of water to a boil. Add the 8 ounces of dried udon noodles and cook according to package instructions, usually about 7-10 minutes. Once cooked, drain and set aside.
In a small bowl, whisk together 1/2 cup low sodium soy sauce, 1/4 cup rice vinegar, 2 tablespoons hoisin sauce, and 2 tablespoons sesame oil. Set this flavorful mixture aside.
In a large skillet or wok over medium-high heat, add the ground chicken or turkey (if using). Cook until browned and fully cooked through, about 5-7 minutes. Break it apart with a spatula as it cooks.
Add the sliced red or orange bell peppers, grated ginger, and chopped Fresno pepper to the skillet. Stir-fry for about 3-4 minutes until the peppers are tender yet still crisp.
Add the cooked udon noodles to the skillet with the vegetables. Pour in the sauce you prepared earlier, tossing everything together until the noodles are evenly coated and heated through.
Remove the skillet from heat and stir in 1/3 cup fresh basil and the chopped green onions. This will give your dish a lovely fresh flavor.
Serve the noodles in bowls, garnishing with a sprinkle of sesame seeds for added crunch. Enjoy your flavorful, spicy udon noodles!