Sheet Pan Crumble Cake
Time: 2 hours 30 minutes
Yield: 10-12 servings
Sheet Pan Crumble Cake is perfect for church potlucks, garden parties, tea times, you name it! In fact, this treat is wonderful any time of the day, including at breakfast! The buttery, rich, and fluffy cake has a touch of tang from the sour cream in the batter. On top, it has a crumbly, crunchy, and sweet cinnamon streusel that will have you coming back for more. Sheet Pan Crumble Cake makes enough for everyone, and yet everyone will still be hoping for more!
Combine the brown sugar, 2/3 cup granulated sugar, cinnamon, and 1 teaspoon kosher salt in a medium bowl.
Add in 2 sticks of melted butter, mixing with a fork until just combined.
Add 3 cups flour and mix with a fork until evenly distributed and small to medium clumps have formed. Be careful not to overmix.
Preheat the oven to 350 degrees F.
Spray an 18x13-inch rimmed baking sheet with cooking spray.
Whisk together the remaining 3 cups flour with the baking powder, baking soda, and the remaining 1 teaspoon kosher salt in a medium bowl.
Beat the room temperature butter and the remaining 1 3/4 cups granulated sugar together in a large bowl with an electric mixer on medium-high speed until light and fluffy, about 5 minutes.
Add the eggs to the butter/sugar mixture one at a time, beating well after each addition.
Beat the vanilla into the butter mixture.
Reduce the mixing speed to low.
Add the flour mixture and the sour cream to the butter mixture in alternating intervals, starting with 1/3 of the flour mixture and then 1/2 of the sour cream, and repeating that pattern until all of the ingredients are added together. Beat until just incorporated.
Spoon the cake batter into the prepared baking sheet, smoothing it with a plastic spatula.
Sprinkle the crumb topping on top, pressing it gently into the batter to adhere it.
Bake until the cake and the topping are golden brown and a toothpick inserted into the center comes out clean, about 40-45 minutes.
Let the cake cool in the pan completely for about 1 hour and then serve!