Mix together the spice rub in a small bowl.
1 teaspoon onion powder, 1 teaspoon garlic powder, 1 teaspoon smoked paprika, 1 teaspoon salt, 1/4 teaspoon black pepper
Pat the chicken breast dry and rub spices evenly on the chicken to coat fully.
2 lbs boneless skinless chicken breasts
Add the BBQ sauce ingredients to the slow cooker and stir to combine. Place the seasoned chicken in the sauce, nestling it down so it's fully covered.
3 tablespoons maple syrup, 1 (15oz) can tomato sauce, 1/3 cup apple cider vinegar, 3 teaspoons Dijon mustard, 1 Tablespoon tomato paste, 1 teaspoon onion powder, 1 teaspoon garlic powder, 1 Tablespoon smoked paprika, 1/2 teaspoon kosher salt
Cook on low for 6-7 hours or on high for 3 hours. Start checking the chicken for doneness at 6 hours. It should reach an internal temperature of 165°F. Larger chicken breasts will take longer to cook.
Use two forks to shred the chicken while it’s still in the crock pot. Serve immediately over roasted sweet potatoes, on a bun or on a BBQ chicken salad.