Add all dry ingredients to the blender, then add pumpkin, followed by all remaining wet ingredients on top. Blend until smooth and well combined.
To cook in Instant Pot:
Spray a 7-inch pan with nonstick cooking spray. Pour in batter and spread out evenly. Then cover with foil.
Add a 3-inch trivet to pot, along with 1 1/2 cups of water. Place pan on top of trivet, lock lid, and cook for 60 minutes at high pressure.
Once cook time is complete, quick-release pressure. Remove pan, uncover, and allow to cool for 10 minutes before serving.
To bake in oven:
Spray muffin, mini-muffin, or loaf pan with nonstick cooking spray. Distribute batter evenly into 24-count mini muffin tin, or 12-count standard muffin tin. Bake mini muffins for 9 minutes at 400 degrees F. If making standard muffins, bake at 400 degrees F for 15 minutes, or until a toothpick inserted in the center comes out clean. If baking in a loaf pan, bake for 30-35 minutes at 350 degrees F.