Follow these easy steps to create your Decadent Carrot Cake Bars with Cream Cheese Frosting:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan and line it with parchment paper for easy removal.

2. Mix Dry Ingredients: In a large mixing bowl, whisk together the all-purpose flour, baking soda, baking powder, cinnamon, nutmeg, and salt.

3. Combine Wet Ingredients: In another bowl, beat the eggs and gradually add in the granulated sugar. Mix in the vegetable oil until combined.

4. Add Carrots and Pineapples: Stir in the grated carrots and crushed pineapples into the wet mixture until well-distributed.

5. Combine Mixtures: Incorporate the dry ingredient mixture into the wet ingredients, mixing until just combined. If desired, fold in the chopped nuts for extra texture.

6. Pour into Pan: Transfer the batter into the prepared baking dish and smooth the top evenly.

7. Bake: Bake in the preheated oven for 25-30 minutes or until a toothpick inserted in the center comes out clean.

8. Cool the Cake: Once baked, remove from the oven and let it cool in the pan for about 10 minutes. Carefully lift it out with the parchment paper and allow it to cool completely on a wire rack.

9. Prepare the Frosting: In a medium bowl, beat together the softened cream cheese and butter until smooth. Gradually add the powdered sugar, mixing well until fluffy. Stir in the vanilla extract.

10. Frost the Bars: Once the bars have cooled completely, spread the cream cheese frosting evenly on top.

11. Cut and Serve: Cut into squares or bars and enjoy!