Instructions:
- Preheat your oven to 350°F (180°C).
- Grease a 9×13 inch baking pan and set aside.
- In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon, and salt.
- In a large bowl, beat together the sugar, eggs, and oil until well combined.
- Add the dry ingredients to the wet ingredients and stir until just combined.
- Stir in the grated carrots and nuts, if using.
- Pour the batter into the prepared pan and smooth the top with a spatula.
- Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
- Allow the cake to cool completely.
- To make the frosting, beat together the cream cheese and butter until smooth.
- Add the confectioners’ sugar and vanilla and beat until well combined and smooth.
- Spread the frosting over the cooled cake and serve.