Preheat the oven to 350.
Spray two 8-ounce coffee mugs (or small ramekins) lightly with cooking spray.
Dice the bread into 1” pieces.
In a small bowl, whisk together the eggs, milk, sugar and vanilla.
Using a very sharp knife, carefully chop 8 of the HERSHEY’S KISSES.
Add the bread and chopped KISSES to the bowl with the eggs and milk. Stir very well to combine.
Divide the mixture between the mugs.
Place the mugs on a small baking sheet, and bake for 25 minutes. The mixture will puff up and rise when you remove it from the oven.
Right when the mugs come out of the oven, top each with the remaining HERSHEY’S KISSES, and let melt slightly before serving.
Serve wrapped in a towel because the mugs are quite warm.