Jalapeño Popper Burgers

Make filling: In a medium bowl, mix together cream cheese, cheddar, mozzarella, and jalapeños. Season with salt and pepper, then fold in cooked bacon.  Form ground beef into 8 large, thin rounds (about ¼”). Spoon about ¼ cup of filling mixture onto one patty, then place a second patty on top. Pinch edges to seal burger and re-shape into a disc if necessary. Repeat with remaining patties and filling mixture.  Sandwich with burger buns and serve immediately.