Preheat the oven to 350°F, and lightly grease a small roasting pan or baking dish.
Place the chopped onion, celery, and carrot in bottom of the dish. Pour in the chicken broth.
1 small onion, 2 ribs celery, 1 medium carrot, 1 cup low-sodium chicken broth
Pat the turkey breast dry and leave the netting on if it comes with one. Spread the Cajun compound butter over the entire turkey breast.
3 to 4 pound turkey breast, ½ cup Cajun compound butter
Place the turkey on top of the vegetables. Cover, and bake for 1 hour 45 minutes to 2 hours, basting once or twice with the pan juices during the cooking time. Note: It's important to follow the cooking time on the package! Mine was around 2 hours.
Remove the turkey from the oven when the internal temperature reaches 165°F on a meat thermometer.
Let the turkey rest for 10 to 15 minutes before slicing.