01 -
Heat olive oil in a large non-stick skillet over medium-high heat. Add ground chicken, diced onion, minced garlic, and diced green bell pepper. Cook, breaking up the chicken, until no longer pink, about 5 to 7 minutes.
02 -
Reduce heat to medium and add ketchup, Worcestershire sauce, yellow mustard, tomato paste, and chili powder. Stir thoroughly to evenly coat chicken and vegetables.
03 -
Pour in water and stir to blend all ingredients uniformly.
04 -
Lower heat to low and simmer for 10 to 15 minutes, stirring occasionally, until flavors meld and sauce thickens slightly.
05 -
While the mixture simmers, toast brioche buns in the oven or on a griddle with butter until lightly golden.
06 -
Spoon the chicken mixture onto the bottom halves of toasted buns, then cover with the top halves and serve immediately.