Grilled Dark Chocolate Sandwich

1/4 cup(s) fat-free evaporated milk
3 ounce(s) bittersweet chocolate, finely chopped
1 1/2 tablespoon(s) butter, softened
8 slice(s) thin whole-wheat or white sandwich bread
3 tablespoon(s) bittersweet or semisweet chocolate chips
2 tablespoon(s) chopped toasted hazelnuts, (optional)



Heat evaporated milk just until boiling. Add chocolate, let stand for 1 minute, then whisk until smooth. Let cool slightly.
Spread butter on one side of each slice of bread. Divide the chocolate mixture on the unbuttered side of 4 slices, leaving a little border. Press chocolate chips and nuts, if using, into the chocolate. Cover with the remaining slices of bread, buttered-side up, and press lightly.
Cook the sandwiches in a large nonstick skillet over medium-high heat for 1 to 2 minutes. Turn over, press with a spatula, and cook until nicely browned and the chocolate is barely melted, 30 seconds to 1 minute. Serve warm.