Artichoke, Caper, & Parmesan Puff Pastry Tart - I Feel Like Cooking

Ingredients

• 1 sheet puff pastry, thawed and rolled into a 10” by 12” rectangle
• 4 T light olive oil, divided
• 1/3 sweet white onion sliced thinly
• 1 ½ C chopped canned artichoke hearts
• 2 T bottled capers
• ½ C finely grated parmigiana Reggiano
• 1 t dried chili flakes