Combine the chicken breasts, chicken broth, salt, pepper, garlic powder, and onion powder in slow cooker. Cook on low for 6-8 hours or on high for 3-4 hours.
Remove chicken from slow cooker and shred with hand mixer or two forks.
For the jalapeno ranch: In a blender or food processor, combine the ranch dressing, jalapenos, lime juice, and garlic powder. Blend until smooth.
Mix the jalapeno ranch into the shredded chicken until well incorporated. Assemble and top tacos as desired.