Preheat your oven to 350°F (175°C) and lightly grease a 9x13-inch baking pan.

In a large mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, ground cinnamon, ground cloves, ground nutmeg, ground allspice, and salt until combined.

In a separate bowl, mix the granulated sugar and vegetable oil until well combined, then add the eggs and vanilla extract, whisking until smooth.

Gently add the dry mixture to the wet ingredients and stir until just combined, being careful not to overmix.

Pour the batter into the prepared baking pan and smooth the top. Bake for approximately 35 minutes until a toothpick comes out clean.

Let the cake cool in the pan for about 10 minutes, then invert onto a wire rack to cool completely.

Prepare the frosting by beating the room-temperature cream cheese and unsalted butter until smooth, then gradually add powdered sugar until desired consistency is reached.

Once cooled, frost the cake and sprinkle with chopped nuts if desired.