Pre heat oven to 350 degrees F. In a large bowl combine flour, powdered sugar, and cornstarch. Using a spoon, mix in apple sauce and vanilla extract until a soft dough forms.
Shape dough into 1-inch balls and place in prepared muffin pans. Press dough in bottom and up the side of each muffin cup. Bake the dough-lined cup for about 8-10 minutes. Remove the muffin pan from the oven and let rest for a few minutes. Spoon 1 teaspoon of preserves into each muffin cup.
In a small bowl mix together sugar, egg and coconut with a fork until well blended. Spoon a teaspoon of coconut mixture over preserves in each cup.
Bake 23 -33 minutes or until cookie crusts are lightly golden brown. Cool in pans on a cooling rack for 30 minutes.
Gently remove each cookie tart, sprinkle with confectioners sugar and serve!