Lightened-Up Slow-Cooker Chicken Buffalo Dip

Two 8-ounce packages reduced-fat cream cheese, cut into small pieces

2 cups shredded white meat from a rotisserie chicken, skin and bones discarded

2 cups shredded low-fat Cheddar (about 6 ounces)

1 cup buttermilk

1/3 cup hot sauce, such as Frank’s

1 tablespoon all-purpose flour

1 teaspoon Worcestershire sauce

3/4 teaspoon cayenne pepper

1 teaspoon garlic powder

1 teaspoon onion powder

1/2 cup parsley leaves, chopped

1/4 cup crumbled blue cheese

Celery and carrot sticks, for serving