Preheat oven to 375° F.
Add the melted butter, cane sugar, and brown sugar to a medium-sized bowl. Using a handheld mixer, mix on medium speed until the butter is well-incorporated into the sugar and there aren't any clumps of brown sugar left. The texture should be crumbly, not smooth.
6 tablespoon unsalted butter, ½ cup cane sugar, ¾ cup light brown sugar
Add the pumpkin puree, eggs, Greek yogurt, and vanilla extract to the butter-sugar mix. Mix on medium speed until the ingredients are fully combined and the texture is smooth.
1 ⅓ cup canned pure pumpkin puree*, 2 large eggs, ⅓ cup plain greek yogurt, 1 tablespoon vanilla extract
In a separate bowl, whisk together the flour, baking powder, salt, pumpkin pie spice, and cinnamon. Add the whisked dry ingredients to the bowl of wet ingredients, and stir with a rubber spatula until there aren't any pockets of flour left.
1 ½ cup all purpose flour, 2 teaspoon baking powder, ½ teaspoon fine sea salt, 2 teaspoon pumpkin pie spice (not allspice), ¾ teaspoon ground cinnamon
Spray a muffin tin with cooking spray and evenly spoon the pumpkin batter into each cup. Set aside.