Set your oven to 350°F (175°C) right away.
Grease your bundt pan with butter or cooking spray.
Dust it lightly with flour to prevent sticking.
Combine flour, baking powder, baking soda, and spices.
Whisk them together in a medium bowl thoroughly.
Set this mixture aside for now.
Beat softened butter and sugar until light and fluffy.
This takes about 3-4 minutes with an electric mixer.
The mixture should look pale and creamy.
Add eggs one at a time, beating well after each.
Mix in pumpkin puree, buttermilk, and vanilla extract together.
Blend until everything is completely smooth.
Gradually add dry ingredients to the wet mixture slowly.
Mix on low speed until just combined together.
Don't overmix or the cake becomes tough.
Pour batter into your prepared pan evenly.
Bake for 60-70 minutes until a toothpick comes out clean.
Let it cool for 15 minutes before removing.