In a small bowl, combine soy sauce, toasted sesame oil, brown sugar, crushed red pepper, and water. Stir until the brown sugar is fully dissolved, then set the stir fry sauce aside for later.
Dice the bell peppers into bite-sized pieces and slice the green onions thinly. Set them aside so they’re ready to toss into the stir fry.
Heat a bit of cooking oil in a large skillet over medium heat. Once hot, add the ground turkey along with minced garlic. Stir regularly and cook until the turkey is browned and fully cooked, and any liquid has evaporated this should take about 8 to 10 minutes.
Once the ground turkey is cooked through, add the diced bell peppers and sliced green onions to the skillet. Stir and cook for about 2 minutes. Then, toss in the spinach and continue cooking just until it begins to wilt, around 1 to 2 minutes more.
Pour the reserved stir fry sauce over the ground turkey and vegetables. Stir everything well to ensure the sauce coats each ingredient evenly, cooking for another 2 minutes or until the spinach is fully wilted.
Spoon about 1 cup of the ground turkey stir fry over ½ cup of rice. Finish with a sprinkle of chopped peanuts for a bit of crunch and added flavor.