Key Lime Tarts recipe - the best key lime pie baked in puff pastry shells. Super easy to make and tastes delicious! Puff pastry shells, sweetened condensed milk, key lime juice, lime zest, vanilla, and egg yolks. Top the tarts with some fresh whipped cream! Reminds me of the key lime pie we ate in the Florida Keys! Great for parties, cookouts, potlucks, and an easy weeknight dessert.