In a small saucepan, add 8 cups water, ½ cup granulated sugar, ½ cup kosher salt, 2 tablespoons maple syrup and 1 tablespoon cajun seasoning. Bring it to simmer and allow to simmer for 5 minutes.
Transfer the brine to a large non-reactive container. Add the remaining water and whisk until completely combined.
Place the chicken breasts into the brine, cover the brine container and place it in the fridge for 3-4 hours.
Prior to removing chicken breast from the fridge, preheat the smoker to 225f. In a small bowl, combine ⅓ cup brown sugar, 2 tablespoons kosher salt, 1 tablespoon paprika, 1 tablespoon garlic powder, 1 tablespoon onion powder, 2 teaspoons ground black pepper, and 1 teaspoon cayenne pepper. Set the rub aside.
Remove chicken from the fridge, rinse well and pat dry. Drizzle with 1 tablespoon olive oil and sprinkle with the rub.
Once the smoker has been preheated, place the chicken on the smoker and place the breasts face up on the middle rack of your grill. Place a temperature probe into the thickest part of the largest chicken breast. Smoke at 225f for 45 minutes.
Increase temperature to 350f and cook the chicken until the internal temperature of the breast reaches 165-170f.
Remove the smoked chicken breasts from the smoker and allow them to rest at room temperature for 5-10 minutes before slicing or shredding.
Notes
How to store + reheat
Smoked chicken breast can be kept in the fridge for 3-4 days or vacuum-sealed and frozen for up to 6 months. Frozen smoked chicken is such a convenient precooked food to have on hand. A delicious pre-cooked protein can make a quick dinner in a real hurry!To reheat, you can pop the chicken into a sous vide bag and reheat in a water bath at 165 for about an hour, microwave until heated through or in a covered baking dish in the oven at 250 for about 20 minutes or until heated through.