In a medium bowl, use your hands to mix together the ground beef, bacon bits, Worcestershire sauce, salt and pepper. Divide mixture into four 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 four cheddar-stuffed patties.

Lay the burgers on foil grates in your slow cooker. Cook on high for 2 1/2 - 3 1/2 hours, checking for doneness in half-hour increments after 2 hours - mine are perfectly cooked in 3 hours, but depending on the size of your slow cooker, this may vary.