My current issue of Real Simple had a recipe for Chocolate Pecan Tart that was a hit; it can be found here: http://www.realsimple.com/food-recipes/browse-all-recipes/chocolate-pecan-tart-00100000068390/index.html
I found the recipe to be straightforward, and easy. The dessert isn’t overly sweet, like some treats are, and it looks fancy, I think, but without too much complication. The only change I made in this recipe was to use dark chocolate instead of the semi-sweet chocolate. I also lined my tart pan with foil for easy clean-up.