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Preheat the Oven:
Preheat your oven to 350°F (175°C). Grease and flour a 9×13-inch baking pan.
Prepare the Cake Batter:
In a large mixing bowl, combine the cake mix, eggs, sour cream, vegetable oil, and vanilla extract. Mix until well combined.
In a small bowl, mix the brown sugar and ground cinnamon, then set aside.
Assemble the Cake:
Pour half of the cake batter into the prepared baking pan and spread it evenly.
Sprinkle half of the brown sugar-cinnamon mixture over the batter, then evenly distribute the diced strawberries over this layer.
Pour the remaining cake batter on top, smoothing the surface, and sprinkle the rest of the brown sugar-cinnamon mixture on top.
Bake the Cake:
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