Ensure all ingredients are at room temperature for optimal mixing and texture. Do not over-mix the cake batter to prevent a dense texture. For a richer flavor, toast the pumpkin spice before adding it to the batter. Always allow the cake layers to cool completely before frosting to prevent the frosting from melting. Store any leftover cake in an airtight container in the refrigerator for up to one week, or freeze individual slices for up to three months.