Step 1

To make cookies: Preheat oven to 300 degrees F. Coat 2 baking sheets with cooking spray.

Step 2

Whisk together sugar, oil, milk, egg white and vanilla in a mixing bowl until no lumps of brown sugar remain. Add oats, flour, baking soda and cinnamon to the bowl and stir until no traces of dry ingredients remain.

Step 3

Divide the dough into 16 equal pieces and form each piece into a ball. Place 8 balls on each prepared baking sheet. Cover each baking sheet with a piece of plastic wrap or wax paper; firmly press each of the balls into a thin 3-inch circle, using a flat-bottomed cup or bowl.

Step 4

Bake the cookies, one sheet at a time, until well-browned, 8 to 10 minutes. Transfer to a wire rack to cool completely.

Step 5

To make sandwiches: If the pieces of fruit are large, coarsely chop them. Soften frozen yogurt in the microwave at medium-low power for 30 to 60 seconds or at room temperature for 10 to 20 minutes; place in a mixing bowl. Swirl the fruit into the softened frozen yogurt. If the yogurt has become too soft, return it to the freezer to firm up slightly. Scoop about 1/3 cup of frozen yogurt onto a cookie and gently press a second cookie on top. Repeat with the remaining cookies and frozen yogurt. Return the sandwiches to the freezer to firm up.