Preheat oven to 425°F. Place one piece of chicken in gallon-size zip-top bag and pound to even thickness using heel of your hand or meat mallet. Lightly season with salt and pepper. Repeat for each piece of chicken.
Wrap each piece of chicken with 2 slices of bacon, using toothpicks to secure bacon if necessary.
In large nonstick skillet, cook chicken 3-4 minutes per side until bacon begins to crisp. Transfer chicken to greased wire rack placed on top of foil-lined baking sheet.
Combine pepper jelly and mustard-reserve ½ cup. Brush remaining jelly mixture over chicken. Bake 15-25 minutes until bacon is crisp and chicken reaches internal temperature of 165°F.
Serve chicken with reserved jelly mixture.