Preheat grill to medium-high heat.

Mix Miracle Whip and 1 tsp of barbecue sauce in a small bowl.

Stir in chopped tomatoes.

Set aside the dressing mixture.

In a separate bowl, mix ground beef, remaining barbecue sauce, and chopped onions.

Shape the meat mixture into four oval patties, approximately 1/2-inch thick.

Cut the baguette crosswise into 4 equal pieces.

Cut each baguette piece lengthwise in half.

Grill the patties for 4 minutes on each side, or until cooked through to an internal temperature of 160F.

Place a Kraft Singles cheese slice on top of each patty.

Add the baguette halves, cut-sides down, to the grill.

Grill for 1 minute, or until the baguettes are lightly toasted and the cheese is melted.

Fill each baguette with a cheeseburger patty.

Top with the prepared Miracle Whip and tomato dressing mixture.