preheat oven to 350F
mix together 3/4 cup softened butter + 2/3 cup brown sugar + 1/3 cup granulated sugar + 1 tsp vanilla
whisk in 2 eggs just until combined
add in 1 1/2 all purpose flour + 1 tsp baking powder + 1 tbsp cinnamon (or apple pie spice)
slowly add in 1/2 cup apple cider and stir until fully combined
scoop evenly into an oiled donut pan (12 total)
bake for 20-23 min
once cooled, brush melted butter on the donut then dip in a cinnamon sugar mixture (1/3 cup sugar + 1 tsp cinnamon)