Preheat oven to 325 degrees. Mix or whisk ingredients in order given, stirring until just combined. Fold in your apples.
Pour batter into a buttered 9×13 pan (alternatively, you can line with parchment paper).
Combine sugar, cinnamon, and butter with a fork until evenly dispersed. Use the fork to press out any clumps; it will have the texture of damp sand. Sprinkle / crumble evenly over the apple cake.
Bake for 45 minutes. Test with a toothpick if needed. Serve with honey butter or whipped cream if you want. APPLE CAKE IS THE BEST!
