Prepare your topping of choice by combining all ingredients in a small bowl and set aside.
Preheat oven broiler with oven rack 6-8 inches from the heat source.
Wipe a small (just slightly larger than the cheese round) cast iron skillet or a similar, oven-safe skillet lightly with vegetable or canola oil.
Place skillet on stove-top over medium-high heat and allow to heat up. Place provolone cheese slice into the skillet and reduce heat to medium (or just slightly lower). Cook, until bottom part of cheese melts out to the edges and starts to crisp and bubble.
Transfer skillet to the oven and broil until cheese is fully melted and golden. Top with topping and serve immediately with toasted bread pieces. *Cheese will stiffen as it cools, so eat up right away.
Be sure to read the "Cook's Notes" in the original post, for more tips, options, substitutions and variations for this recipe!