Step 1

In a large bowl, mix the ground beef, oregano, onion powder, lemon pepper, and salt. Divide the mixture and form into 4 patties.

Step 2

Spray the bottom of the slow cooker with non-stick cooking spray. Place the burgers in the bottom of the crock, in a single layer.

Step 3

Cover the burgers with the barbecue sauce, and cook on low for 3-4 hours, until they reach an internal temperature of 160 degrees F.

Step 4

When the burgers are almost done, slice the onion into rings.

Step 5

Melt the butter in a large saucepan over medium high heat, then add the onions.

Step 6

Toss the onions to coat with the butter, then allow them to cook, stirring frequently, until they become browned and caramelized.

Step 7

Build your burgers with buns, cheese, and lettuce as desired. Drizzle a little extra barbecue sauce over the burger, then pile on some of the caramelized onions.