Chocolate Crumb Cake recipe – chocolate cake mix topped with an easy homemade crumb topping. This cake is OUTRAGEOUSLY good! Chocolate cake mix, egg, oil, water, sugar, brown sugar, cinnamon, butter, and cake flour. Super easy to make and tastes great. I could not stop eating it! Great for overnight guests, potluck dinners, and holiday mornings.
Prepare cake mix according to package directions and add vanilla. Pour into lightly greased and floured 9x13-inch pan.
In the bowl of an electric mixer, combine granulated sugar, brown sugar, salt, cinnamon, melted butter, cocoa powder, and all-purpose flour. Mix until combined and crumbly.
Sprinkle crumb mixture over cake, covering completely. Start at the edges and work your way towards the center for best results.
Bake for 30 to 35 minutes.
Notes:
Make sure to cover the entire top of the cake batter with the crumb topping layer.
If you don't cover the cake completely, the cake batter will bubble up through the crumb topping.
Line the cake pan with parchment paper to easily remove the cake from the pan.
Top the cooled cake with powdered sugar or a quick powdered sugar glaze.
The cake can be made a day or two in advance and stored in an airtight container.