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 softened and fragrant.
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 thickens to desired consistency.
05 - Taste and adjust seasoning as needed with additional salt, pepper, or spices.
06 - Spoon the turkey mixture onto toasted buns and serve immediately.