Thaw puff pastry dough at room temperature for 20-30 minutes.
Cut apples into paper thin slices. Simmer over low heat in a medium pot of Simply Apple for 3-5 minutes to soften. Pour mixture into a bowl and set aside, leaving 1 cup of Simply Apple in pot.
To make glaze reduction, add 3 tbsp of sugar to the pot, and reduce to half over medium flame. Let cool completely.
Lightly flour your counter. Using a rolling pin, stretch puff pastry dough, keeping it in a rectangular shape. Cut into 6 strips, each about 2 in x 9 in.
Mix brown sugar, melted butter, cinnamon, and salt in a bowl. Spread mixture over dough strips.
Drain apple slices and arrange in a straight line on top of dough strips. Fold the bottom of the dough over the bottom of the apples.
Carefully roll dough, seal the edges, and place in a muffin pan (grease if needed).
Bake for 40-45 minutes, until fully cooked. If tops of the apples look fully cooked after 30 minutes, move the pan to a lower rack for the remainder of cook time.
Using a pastry brush, glaze cooked tarts with the Simply Apple reduction. Dust with a dash of powdered sugar.