Apple Cider Donut Cake

Direction :

Preheat oven, prep pan, and whisk together dry ingredients:
Preheat oven to 350°F. Generously butter and flour a 12-cup Bundt pan; use a pastry brush to be sure to get into all the crevices. In a large bowl, whisk together both flours, baking powder, 1 teaspoon cinnamon, baking soda, and salt.
Whisk together wet ingredients:
In another bowl, whisk together 1 1/2 cups sugar, cider, oil, applesauce, vanilla, and eggs.
Add wet ingredients to dry; transfer to pan:
Add egg mixture to flour mixture; whisk until combined. Transfer batter to prepared pan.
Bake and cool; mix sugar and cinnamon:
Bake, rotating pan halfway through, until a tester inserted in center comes out clean, 45 to 50 minutes. Transfer pan to a wire rack set over a rimmed baking sheet; let cool 15 minutes. Meanwhile, mix together remaining 1/4 cup sugar and 1/2 teaspoon cinnamon.
Invert cake; brush with butter and sprinkle with cinnamon sugar:
Invert warm cake onto rack. Brush with melted butter, then sprinkle liberally with cinnamon sugar. Let cool completely before serving.