Preheat oven to 425 degrees.
In a large bowl cream the butter with a mixer. Add granulated sugar and cream together.
8 tablespoons unsalted butter, 1 cup granulated sugar
Add eggs, one at a time. Mix to combine.
2 eggs
Add buttermilk and reduced apple cider. Mix to combine.
½ cup buttermilk, 2 cups apple cider
In a separate bowl sift together the dry ingredients: flour, baking powder, baking soda, cinnamon, salt and nutmeg.
3 ½ cups all purpose flour, 2 teaspoons baking powder, 1 teaspoon baking soda, ½ teaspoon ground cinnamon, ½ teaspoon kosher salt, 1/8 teaspoon nutmeg
Slowly add the dry ingredients to the wet ingredients using a mixer to ensure they are fully combined.
Prepare donut pans with cooking spray. Fill the donut cavities no more than 2/3 full. Place in the oven for 7-9 minutes until donuts spring back to the touch.
Remove donuts and allow to sit in the pan for 5 minutes. Turn out onto a cooling rack to cool completely.