Pound chicken breasts to 1 inch thick between wax paper for even cooking.
Whisk balsamic vinegar, brown sugar, steak seasoning, and rosemary. Slowly add olive oil. Coat chicken, cover, and refrigerate 2–24 hours.
Fry diced bacon until crispy. Drain, keeping a thin layer of grease in the skillet.
Add honey, Worcestershire sauce, hot sauce, black pepper, and smoked paprika to skillet. Bring to a boil, add bacon, cook 2 minutes, then transfer to a bowl to thicken.
Heat oiled skillet over medium-high. Cook marinated chicken 4–6 minutes per side until 165°F.
Rest chicken 5 minutes, then drizzle or toss with glaze before serving.