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.
Preheat grill to medium-high. Season burgers on both sides with chili powder, salt, and pepper. Place on grill and cook until cooked through to your liking, about 6 minutes per side for medium.
Sandwich with burger buns and serve immediately.
Recipe by The Best Video Recipes for All at https://recipes-for-all.com/jalapeno-popper-burgers/