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Export 7 ingredients for grocery delivery
Step 1
Preheat oven to 325 degrees and spray a 9x13-inch baking dish with cooking spray.
Step 2
In a large bowl, stir together cake mix, eggs, vegetable oil, and sour cream until smooth.
Step 3
Pour half of cake batter into prepared pan and smooth it out.
Step 4
Stir together brown sugar and cinnamon in a bowl. Sprinkle evenly on top of cake batter.
Step 5
Cover with remaining cake batter, spreading it evenly. Run a knife in a swirling pattern through the cake batter.
Step 6
Bake 30 to 35 minutes.
Step 7
In a medium bowl, whisk together powdered sugar, milk, and vanilla. Pour over hot cake. Let cake cool 20 minutes before cutting.