Preheat your grill (direct grilling over high heat).

Meanwhile, in a medium skillet, melt butter over medium-high heat. Add onion and jalapeno and cook until softened. Remove from heat and set aside to cool slightly.

Divide the ground beef into 8 equal portions. Divide each of the 8 portions in half - for a total of 16 chunks of ground beef. On waxed paper, flatten 8 of the chunks of ground beef into thin patty shapes.

In a medium bowl, combine the bacon, cheese and the veggie mixture. Mix well. Place about ¼ cup of the mixture in the center of each of the 8 patties.

Take the other 8 chunks of ground beef and flatten slightly between your hands and place one portion on top of one the patties with the bacon, cheese and veggie mixture. Carefully seal the 2 beef patties together. Season the top with salt and pepper.

Place the burgers on the grill and grill for approximately 4-5 minutes. (Use your best judgment here - all grills are different!) Carefully flip and continue to cook the patties for another 3-4 minutes or until the meat is cooked through (cook to 160°).

Using a basting brush, brush the burger with BBQ sauce. Allow to cook for an additional minute or two - and baste with BBQ sauce again. Remove the burgers from the grill and allow them to rest for a few minutes before serving. (Now is a great time to toast your buns if you like them toasted!)

Serve on buns with your favorite condiments and toppings!