Preheat your oven to 350° F. Spray a standard size (12 cup) bundt cake (or tube cake) pan with non-stick spray, then coat with flour.
Place yellow cake mix, melted butter, apple cider, eggs, cinnamon and nutmeg in a large mixing bowl. Beat for 2 minutes with an electric mixer on medium speed. Scrape the bowl occasionally, to incorporate all ingredients into batter. Peel, then grate 2 medium tart apples. Add the shredded apple to the batter. Stir well, to fully combine.
Pour the batter into generously greased and floured bundt pan. Bake at 350° for 35-40 minutes, or until golden brown on top and a toothpick inserted into the middle of cake comes out clean. Remove cake from oven. Let it "rest" in pan for 20 minutes on a wire rack, to cool slightly.
While cake is cooling, melt butter in a small dish or pan. Combine sugar and ground cinnamon in a separate small dish. Set aside.
After cake has cooled, run a spatula (or metal butter knife) around edges of the bundt pan, to help loosen cake from pan. Once loosened, place a large plate over top of pan. Holding pan securely to the plate with both hands, quickly invert (turn upside down) the cake. It should release easily from bundt pan. Place cake on wire rack. TIP: It is very helpful to place a large piece of parchment or wax paper UNDER the wire rack to catch drips.
Use a pastry brush and completely cover the top and sides of the cake with melted butter. Use ALL of the melted butter. Sprinkle 2/3 of cinnamon sugar mix (save the rest for later) onto the buttered top, sides, and middle ring of cake, pressing it onto the cake. It's helpful to hold hands right up next to the sides of cake when adding cinnamon sugar, to catch any that falls. Let cake rest for another 20 minutes. After 20 minutes, sprinkle top and sides of cake again with remaining cinnamon sugar mix. Press mixture into the cake with fingers.
Once done, let cake cool completely, then slice and serve! Enjoy!
NOTE: I used Betty Crocker Super Moist Yellow Cake Mix for this recipe.
Apple Cider Bundt Cake https://www.thegratefulgirlcooks.com/apple-cider-bundt-cake/