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Leave for 4 minutes, then turn over and toast the other side for 4 minutes. Or, heat for as long as it takes to be browned on both sides.  Place the squares on each bread half. Leave about 1/2 inch (1.2cm) at the edge free of chocolate as it will melt into this area. Bake for 1 to 2 minutes or until the chocolate starts melting. It should have a glossy texture. Sprinkle a few small drops of olive oil onto each slice and season with a pinch of salt for each slice. If you don't like the thought of oil and salt on the chocolate, skip; however, it does bring out a great flavor, which is why this is a popular method. Enjoy with a hot chocolate and some fresh berries in a side bowl.

Summary:
Preheat the oven to 350ºF (180ºC). Place the crusty bread slices on a baking sheet. Place in the oven to toast. Cut the slices in half. Break the chocolate into squares. Put the chocolate covered bread back into the oven. Remove from the oven. Serve immediately.