Now, let’s get to the heart of the matter: how to make this delectable cake. Follow these steps, and you’ll have a homemade dessert that’s bound to impress.

1. Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking pan or line it with parchment paper.
2. In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, nutmeg, and allspice. Set aside.
3. In a large bowl, beat the sugar and melted butter together until well combined. You can use a hand mixer or a good old-fashioned whisk.
4. Add the pumpkin puree, eggs, and vanilla extract to the sugar mixture, stirring until smooth and creamy.
5. Gradually add the dry ingredients to the wet mixture, alternating with the buttermilk. Mix until just combined, being careful not to overmix.
6. Pour the batter into the prepared baking pan, spreading it evenly with a spatula.
7. Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. The cake should spring back lightly to the touch.
8. Allow the cake to cool in the pan for about 10 minutes before transferring to a wire rack to cool completely.

As you bake, remember the wisdom from my grandmother: cooking is an art, not a science. Trust your senses and enjoy the process!