Add the chicken breasts to the slow cooker. Pour in the chicken broth, cream of chicken soup, garlic powder, onion powder, salt, and pepper. Stir to combine.
Cover and cook on low for 5 hours until the chicken is tender.
Shred the chicken directly in the slow cooker with two forks. Stir in the broccoli florets and 1 1/2 cups of the cheddar cheese.
Cut each biscuit into quarters and arrange them over the top of the mixture.
Cover and cook on high for 1 hour until the biscuits are cooked through and no longer doughy in the center.
Sprinkle the remaining 1/2 cup cheddar cheese over the top just before serving.