01 - In a large skillet over medium heat, add the ground turkey. Cook, breaking up with a spoon, until no longer pink, approximately 5 to 7 minutes.
02 - Add the chopped onion, green bell pepper, and garlic. Sauté for 4 to 5 minutes until vegetables are softened.
03 - Stir in the tomato sauce, tomato paste, Worcestershire sauce, brown sugar, mustard, smoked paprika, salt, black pepper, and red pepper flakes if using.
04 - Reduce heat to low and simmer uncovered, stirring occasionally, for 10 to 12 minutes until the sauce reaches desired thickness.
05 - Taste the mixture and adjust salt, pepper, or other seasonings as needed.
06 - Spoon the turkey mixture onto toasted buns and serve immediately.