01 -
Get your oven hot at 350°F (175°C).
02 -
Grab a big bowl and mix together the oil or applesauce with sugar and eggs.
03 -
Add the flour, baking soda, baking powder, salt and cinnamon and stir until everything's mixed.
04 -
Gently add carrots, coconut, nuts if you're using them, vanilla and pineapple with its juice.
05 -
Pour your mix into a 10x15-inch jelly roll pan that's greased lightly or lined with parchment.
06 -
Let it bake for about 25-30 minutes. It's done when you stick a toothpick in the middle and it comes out clean. Cool it completely.
07 -
Whip butter with cream cheese till light and fluffy. Throw in vanilla and sugar, then blend until it's smooth.
08 -
Put the creamy topping all over your cooled cake bars.
09 -
Any leftovers should go in a sealed container in the fridge and they'll stay good for 3 days.