Pre-heat oven to 350°F. Lightly flour or grease a bundt pan.
In a medium bowl, sift together flour, baking soda, baking powder, cinnamon, and salt. Set aside.
Using an electric mixer, cream together sugar, brown sugar, and butter. Add eggs one at a time, mixing between each addition. In a small bowl, stir together applesauce and milk. Alternate adding dry ingredients and wet ingredients, three times, slowly mixing between each addition. Stir in apples just until combined.
Spread the batter evenly around the prepared bundt pan and bake for 52-58 minutes, until a toothpick comes out clean when inserted. Let rest for 10 minutes, then invert pan to remove cake.
Once the cake has cooled, drizzle caramel sauce over the cake and sprinkle salt evenly around right before serving (for the texture of it - otherwise it will melt into the caramel). Serve a slice of cake with whipped cream if desired (highly recommended!).