Slow-Cooker Sloppy Joe Sliders

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1 1/2 pounds ground beef (80 percent lean)

2 cloves garlic, grated 

1 inner stalk celery (with leaves), finely chopped 

1 red bell pepper, finely chopped 

1/2 onion, finely chopped 

One 14.5-ounce can tomato sauce, such as Pomi

1/2 cup ketchup 

1 tablespoon chili powder 

1 tablespoon dry mustard 

1 tablespoon onion powder 

1 tablespoon sugar 

1 tablespoon Worcestershire sauce 

Kosher salt and freshly ground black pepper 

16 slider buns or mini potato rolls, split