Using an injector syringe, inject Cajun Injection Marinade into the turkey breast on different angles. If you have any left you can pour it over the top.
¾ Cup Cajun Injection Marinade
Allow to sit at room temperature for an hour, marinating. Reinject as it seeps out over the course of the hour.
Preheat the oven to 350°F.
Sprinkle the Cajun Seasoning all over the outside of the turkey breast and bake in the oven, uncovered, for about 1-½ hours. Until a meat thermometer reads 160°F. (it will reach the required 165° after you take it out of the oven)
2 teaspoons Cajun Seasoning
Place a foil tent over the top of the turkey breast and allow to sit for 1 hour before slicing.
Notes
You can use Creole Seasoning instead of Cajun Seasoning - it's almost the same thing.If you have skin on your turkey breast, that's great. When you first put it in the oven, have the temperature set at 450° and cook for 15 minutes skin side up. Then after 15 minutes turn the oven down to 350°. Reduce the cooking time to about 1hr 15. This will keep your crisp skin.A meat thermometer will be important, I like the kind that you can leave in the meat while it's in the oven. Like this one. Set it to 160°F - you'll see it go up to 165 after you remove from the oven.