Preheat the oven to 400°F and cook puff pastry shells according to directions on package. When shells are done, allow to cool. Set aside.
Place each ear of corn on a sheet of aluminum foil. Drizzle with olive oil. Wrap up and place in oven to cook for 35-40 minutes. Set aside and allow to cool completely.
When corn has cooled, cut corn from cob. Place in a bowl.
Add onion, chili powder, lime juice, bell pepper to bowl. Mix well together.
Spoon into pastry shells. Top with feta and cilantro. Serve and ENJOY!