Indulge in the delightful combination of caramelized onions and creamy goat cheese with these exquisite tarts. Perfect for any occasion, these savory pastries feature a flaky puff pastry base that complements the rich, sweet flavor of the onions and the tangy softness of the cheese. Easy to make at home, these tarts offer a gourmet touch to your meals, whether you're hosting a dinner party or enjoying a cozy night in. Impress your guests and savor every bite!
1 sheet of puff pastry (thawed)
2 large onions (thinly sliced)
2 tablespoons olive oil
1 tablespoon balsamic vinegar
1 teaspoon sugar
Salt and freshly cracked pepper to taste
4 ounces goat cheese (crumbled)
1/2 cup crème fraîche (or sour cream)
Fresh thyme leaves (for garnish)
1 egg (beaten, for egg wash)