Heat olive oil in a large skillet over medium heat. Add diced bell pepper and onion; cook for 3-4 minutes until softened and slightly caramelized.

Stir in minced garlic and cook for another minute, being careful not to burn it.

Add ground chicken to the skillet. Break it apart with a spoon and cook for 5-7 minutes until fully browned and no longer pink.

Pour in tomato sauce, ketchup, Worcestershire sauce, Cajun seasoning, smoked paprika, salt, and pepper. Stir to combine well.

Reduce heat and let the mixture simmer for about 10 minutes to allow flavors to meld.

While the chicken simmers, toast the hamburger buns until golden brown.

Spoon the chicken mixture onto the bottom halves of the buns. Add any optional toppings you prefer, then place the top buns on.

Serve immediately while hot.