In a medium bowl, gently combine the ground beef, chopped onion, minced garlic, salt, and black pepper. Do not overmix.
In a small bowl, whisk together the ketchup, Worcestershire sauce, brown sugar, and paprika to create the glaze.
Divide the beef mixture into 6 equal portions and form into patties. Make a slight indentation in the center of each patty to prevent them from puffing up during cooking.
Preheat your grill or a skillet to medium-high heat. Grill or pan-fry the burgers for about 4-5 minutes per side for medium-rare, or to your desired doneness.
During the last 2 minutes of cooking, brush the glaze generously over both sides of the burgers. Add a slice of cheddar cheese on top of each burger and allow it to melt.
Lightly toast the burger buns on the grill or in a pan. Place the glazed, cheesy burgers on the toasted buns and serve immediately.
Notes
Serve these crack burgers with your favorite toppings like lettuce, tomato, pickles, or extra glaze!