Here's something to do with that other sheet of puff pastry (leftover after you made the swiss chard tart). This is a quick and easy appetizer that tastes amazing and never fails to please guests. Oh, and plus? Only four ingredients.
1 T olive oil
2-3 large red onions, sliced
1-2 sheets puff pastry dough
1 cup goat cheese
Sauté the onions in olive oil over gentle heat 10 minutes or so, until very soft. Remove, let cool. Let the pastry sheet(s) thaw slightly and unfold on a cookie sheet. Cut into 9 equal squares for each sheet, and gently score ¼ inch inch around each square. Divide the onions equally among the squares, and top with lots of goat cheese. Bake at 425 25-30 minutes or until golden brown. Serve piping hot.
Cost: $2.50 for one sheet of puff pastry (a package of two is $4.99), plus maybe 50 cents for the onions and another couple of dollars for the goat cheese, depending on what kind it is and whether you bought it in bulk (and how much you use, of course--I love goat cheese, so I use quite a lot, way more than 1 cup). Maybe $5 total for a set of 9 substantial appetizers.