In a second bowl, combine the vegetable oil, eggs, sugar and pumpkin puree. Whisk until the ingredients are just combined.
1 cup vegetable oil, 1 cup sugar, 4 eggs, 1 (15 oz) can pumpkin puree
Add the wet ingredients to the dry, and use a whisk or spatula to gently blend the ingredients together.
Pour the cake batter into the baking pan, and transfer it to an oven. Bake for about 30 minutes, or until a toothpick inserted into the middle comes out clean.
Allow the cake to rest for 10-15 minutes, then transfer it to a cooling rack and allow it to cool down completely.
Make the frosting by combining slightly softened butter with cream cheese and powdered sugar. I recommend using an electric whisk to make the frosting completely smooth.
1 (8 oz) block cream cheese, ½ cup unsalted butter, 2 ½ cup powdered sugar, ½ teaspoon vanilla extract
Spread the frosting across the top of the cake, and cut it into 20 small squares. Store the cake in a refrigerator until it's ready to serve.
Notes
You can mix in chocolate chips or raisins to the cake batter before you cook the cake.
Add a few drops of a flavor essence of your choice to the frosting or use a different frosting, such as caramel, toffee, chocolate, or coffee frosting.
You can substitute cinnamon or gingerbread spice for the pumpkin pie spice.
This is a moist, dense pumpkin cake, and pan size will affect both bake time and thickness.
8x8-inch pan: Produces a thicker cake. Fill pan no more than about ¾ full and bake 35–45 minutes, checking the center with a toothpick. If the top is browning before the center is set, loosely tent with foil and continue baking until done.
9x9-inch pan: Produces a slightly thicker cake. Bake 30–35 minutes and test the center for doneness.
9x13-inch pan: Produces a thinner cake that bakes more evenly. Bake 25–30 minutes, or until a toothpick inserted in the center comes out clean.
Oven temperatures and pan materials can vary, so always rely on visual cues and doneness tests rather than time alone.