Preheat your oven to 350 F.
Place the bacon on a foil-lined bacon sheet and place into the oven to partially cook the bacon while assembling the patties. You do not want the bacon to get crispy, just slightly done. Remove and let cool.
In a large bowl, combine the ground beef, bell pepper, onion, chili sauce, Worcestershire sauce, basil, salt and pepper.
Form the meat into 8 equally-sized patties.
Melt the butter in a medium skillet.
Add the mushrooms and saute until soft.
Spoon a small amount (do not use them all) of the mushrooms into the center of 4 of the patties.
Cover with the other patties and pinch along the edges to seal.
Wrap patties with the bacon and secure with toothpicks. Transfer to a shallow pan.
Pour sauce over patties and bake for 45 minutes.
Garnish with remaining mushrooms and serve.