In large skillet, cook bacon over medium high heat until evenly brown, about 5 minutes. Remove bacon from skillet and drain fat completely. Once cool enough to touch, crumble or chop bacon into small pieces. Turn the heat down to medium and pan fry the onions, mushrooms and jalapeno peppers in the remaining bacon drippings until tender. Season with salt and pepper. Mix together mushroom mixture and bacon in a small bowl.

Shape ground beef into16 thin patties. Add one patty to bottom of burger press. Use "stuffed side" down to create a pocket in patty. Fill with 2 tablespoons of cheese and 2 tablespoons of mixture. Cover stuffed pocket with a patty. Using the "pressed" side facing down seal edges.

Brush each side of stuffed burgers with steak sauce.

Grill burgers, uncovered, over medium-high heat for 5-6 minutes on each side or until a thermometer inserted in meat portion reads 160°.

Serve stuffed burgers on rolls. Top with dressing, tomato, and lettuce.