Combine cinnamon, granulated sugar, and brown sugar in a small mixing bowl and set aside.
In a medium mixing bowl, combine apples, lemon juice, salt, and 1 1/2 tablespoons cinnamon-sugar mixture. Mix until apples are evenly coated.
Separate biscuit dough and place on a piece of parchment paper or greased countertop.
Use rolling pin or your hands to form each piece of dough into 5 x 4-inch ovals approximately 1/8 inch thick.
Insert grill grate and close hood. Select GRILL, set temperature to LO, and set time to 9 minutes. Press START/STOP to begin preheating.
While unit is preheating, place 1/2 cup apple mixture on each oval of dough, leaving a 1/2-inch space on either side, and a 1-inch space on the top and bottom.
Fold the sides up around the apple mixture, leaving an inch of apples exposed in the center. Seal the top and bottom of the dough by pinching exposed portion firmly and twisting clockwise to form a canoe-like shape.
Coat each tart liberally with cooking spray and sprinkle with the remaining cinnamon-sugar mixture.
When unit beeps to signify it has preheated, place tarts on grill grate. Close hood and cook for 6 minutes.
When cooking is complete, remove tarts. Serve immediately with vanilla ice cream or whipped cream.
