Prepare grill for medium-high heat.
In large bowl, combine beef, salt and pepper; mix gently. Form beef into 4 patties; grill until desired doneness. Top each burger with 2 slices cheese, if desired.
In microwave-safe bowl, microwave peanut butter 30 seconds.
Place patties on bottom halves of buns. Generously spread warm peanut butter on each patty. Top with 2 to 4 slices bacon; cover with top halves of buns.
This recipe is recommended for 4 servings.