Caramelized Onion and Balsamic Tomato Tarts

Bahan-bahan (4 porsi)

• 2 tablespoons extra virgin olive oil
• 1 yellow onion, thinly sliced
• 1 teaspoon honey
• kosher salt and black pepper
• 1 g arlic clove, minced or grated
• 2 tablespoon fresh thyme leaves, plus more for serving
• 1 cup shredded sharp cheddar cheese
• 1/2 cup shredded Havarti cheese
• 1 sheet frozen puff pastry, thawed
• 2 cups cherry tomatoes
• 2 tablespoons balsamic vinegar
• 1/4 cup fresh basil, chopped
• 1 pinch crushed red pepper flakes
• 1 egg, beaten
• everything bagel spice, for sprinkling
• fresh chopped chives