Caramelized Onion and Goat Cheese Tart

I took a class at the Ashburn Cookology class a few years ago, courtesy of a gift certificate my dear husband gave me on some occasion.  We were doing a class with the theme of pies/tarts, and this was one of Executive Chef Brad Spates' selections.  DELICIOUS!! 

Ingredients:
1 sheet of prepared puff pastry
1 onion halved, and sliced
3 oz. chèvre goat cheese
1T butter

Directions:
Melt butter in sauté pan over medium high heat. Add butter and caramelize onions, stirring constantly for five minutes until they are nicely browned. cut puff pastry into squares and place chunk of goat cheese and caramelized onion in center, fold edges over slightly and bake at 400F for 14 minutes.