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.
