Preheat & prep: Grease a 9×13 baking pan and preheat the oven to 400°F.
Cream butter and sugar: In a mixing bowl, cream the butter and sugar together until smooth.
Add wet ingredients: Add the milk and eggs, mixing until well combined.
Add dry ingredients: Stir in the flour, baking powder, and salt until just combined.
Pour batter: Pour the batter into the prepared pan and set aside.
Make crumble topping: In a separate bowl, combine the flour, sugar, cinnamon, and butter. Cut in the butter until crumbly, then sprinkle evenly over the batter.
Bake: Bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
Cool & serve: Remove from the oven, let cool slightly, then slice and enjoy.
Video
Notes
Do not overmix the batter or the cake may turn dense
Room temperature ingredients mix more evenly and bake better
Let the cake cool slightly before slicing for cleaner pieces
Store covered at room temperature for up to 3 days or refrigerate up to 5 days
Freeze slices up to 2 months and reheat before serving