Preheat oven to 375°. Place muffin liners in muffin pan.
Melt butter and set aside.
Whisk together dry ingredients in a bowl.
BATTER
Put dry ingredients into mixer.
Add melted butter, oil, pumpkin puree, eggs, buttermilk and vanilla and mix until just combined.
BAKE
Pour batter into liners filling them 3/4 full.
Turn down oven to 350° and bake for 23 minutes until toothpick in center comes out clean.
Let muffins cool. Use a sieve or fork to dust muffins with powdered sugar.
Notes
TO MAKE GLUTEN-FREE-Substitute with your favorite gluten-free flour.TO MAKE VEGAN - Substitute buttermilk with apple cider or unsweetened oat milk, almond milk or coconut milk. - Swap out eggs by placing 1 T. vinegar over the baking soda when it is added.