01 - 
                Preheat oven to 350°F (175°C).
              
              
              
                02 - 
                In a large bowl, combine applesauce or oil, sugar, and eggs.
              
              
              
                03 - 
                Stir in flour, baking soda, baking powder, salt, and cinnamon until combined.
              
              
              
                04 - 
                Fold in grated carrots, shredded coconut, chopped nuts (if using), vanilla, and crushed pineapple (with juice).
              
              
              
                05 - 
                Pour the batter into a lightly greased or parchment-lined 10x15-inch jelly roll pan.
              
              
              
                06 - 
                Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Let it cool completely.
              
              
              
                07 - 
                Beat the butter and cream cheese together until fluffy. Add vanilla and powdered sugar, and mix until smooth.
              
              
              
                08 - 
                Spread the frosting evenly over the cooled cake bars.
              
              
              
                09 - 
                Keep leftovers in an airtight container in the refrigerator for up to 3 days.