Step 1

To prepare the onion marmalade, heat 1 tablespoon olive oil in a large skillet over medium high. Add onions, brown sugar, and salt. Sauté for 15 minutes, stirring occasionally, until dark golden brown and tender. Add balsamic vinegar and cook 2 additional minutes. Set aside.

Step 2

Meanwhile, heat a large oven proof skillet over medium high. Place rack in the upper third of your oven and set oven broiler to high.

Step 3

Next, prepare the burger patties by mashing the black beans in a large bowl. Add beaten egg, 3 tablespoons extra virgin olive oil, 1 tablespoon Dijon mustard, garlic powder, salt, pepper, and worcestershire. Mix until incorporated.

Step 4

Add beef and stir in gently with a fork, being careful not to compress the meat. Divide the mixture into 6 portions and shape into approximately 3 1/2 inch-wide patties. Brush each side of the patties with remaining mustard.

Step 5

Brush the skillet with extra virgin olive oil to prevent sticking. Add the burgers to the skillet and cook for 3-4 minutes, until the mustard forms a golden crust. Flip, top with blue cheese, then cook for 3 additional minutes, longer if you prefer the burgers more well done.

Step 6

During the last moments of cooking, place the skillet under the oven broiler for 30 seconds to finish melting the blue cheese.

Step 7

Top blue cheese burgers with a heaping spoonful of onion marmalade and serve immediately on toasted buns.