In a medium bowl, use your hands to mix together the ground beef, bacon bits, Worcestershire sauce, salt, and pepper.

Divide the mixture into 4 equal parts.

Shape each section into two equal-sized patties.

Sandwich a cube of cheddar between them and press together to seal.

Repeat until you have 4 cheddar-stuffed patties.

Lay burgers on foil grates in your slow cooker.

Cook on high for 2½-3½ hours, checking for doneness in half-hour increments after 2 hours.