Mini Lemon Curd Tarts

To prepare crusts: Preheat oven to 350°F. Line a 12-cup muffin tray with paper liners; lightly coat with cooking spray. Combine crumbs, melted butter, 1/4 cup sugar and 3 egg whites in a large bowl; stir until well mixed. Place about 3 heaping tablespoons of the mixture into each muffin cup, firmly pressing into the bottom and up the sides.

Bake until lightly browned and set, about 12 minutes. Transfer the pan to a wire rack and let cool completely, about 10 minutes. Remove the crusts from the pan; remove and discard the liners. Place the crusts on a large plate.

Meanwhile, prepare filling: Whisk eggs, egg yolks, sugar, butter, lemon zest and lemon juice together in a medium saucepan. Cook over medium heat, stirring constantly, until thickened, about 5 minutes. Pour the mixture through a fine-mesh strainer into a medium heatproof bowl.

Divide the lemon curd among the crusts (about 2 tablespoons each). Cover and refrigerate until chilled, about 1 hour.