Creating a Spicy Slow Cooker BBQ Chicken Sandwich is a breeze if you follow these straightforward steps:

1. Prepare the Slow Cooker: Place the boneless chicken breasts in the slow cooker.
2. Mix Spices: In a small bowl, combine chili powder, paprika, garlic powder, onion powder, black pepper, and salt. Sprinkle the spice mixture over the chicken, ensuring it is evenly coated.
3. Add BBQ Sauce: Pour 1 cup of BBQ sauce over the chicken, ensuring all pieces are covered. If you like it spicy, feel free to mix in sliced jalapeños at this stage.
4. Cover and Cook: Secure the lid on the slow cooker. Cook on low for 6-7 hours or on high for 3-4 hours, until the chicken is fully cooked and tender.
5. Shred the Chicken: Once cooked, remove the chicken from the slow cooker. Using two forks, shred the chicken into bite-sized pieces.
6. Mix with Sauce: Return the shredded chicken to the slow cooker and stir to coat it in the remaining sauce. Let it heat through for an additional 10-15 minutes.
7. Prepare the Rolls: While the chicken is heating through, lightly toast sandwich rolls or buns.
8. Assemble the Sandwich: Divide the chicken mixture among the sandwich rolls. Top with coleslaw if desired for an added crunch.
9. Serve: Drizzle with extra BBQ sauce if you like and serve immediately while hot.

These steps will guide you through creating this incredible sandwich that is perfect for any occasion.