Instructions
1. Prepare the Ingredients:
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In a medium bowl, combine the eggs, 1 cup of milk, and sour cream. Let them sit on the counter for 30-45 minutes to come to room temperature.
2. Preheat and Prepare the Pan:
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Arrange an oven rack in the middle position and preheat the oven to 350°F (175°C).
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Grease a 9×13-inch baking dish with the 1 tablespoon of vegetable oil.
3. Make the Cake Batter:
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In a large bowl, whisk together the flour, brown sugar, granulated sugar, cocoa powder, baking powder, and baking soda until well combined.
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To the room-temperature egg mixture, add the 1 cup of vegetable oil, vanilla extract, and salt. Whisk until smooth and fully combined.
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Pour the wet ingredients into the dry ingredients. Stir with a wooden spoon or spatula until just combined and no dry streaks remain. Be careful not to overmix.
4. Bake the Cake:
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Pour the batter into the prepared baking dish and spread it evenly.
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Bake for 30-33 minutes, or until a toothpick inserted into the center of the cake comes out clean.
5. Add the Marshmallow Layer:
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As soon as the cake is out of the oven, evenly scatter the mini marshmallows over the top.
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Return the cake to the oven for 2-3 minutes, just until the marshmallows are soft and begin to melt.
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Place the cake on a wire rack to cool for 30 minutes while you make the frosting.
6. Prepare the Frosting:
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In a large saucepan over medium heat, melt the butter.
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Whisk in the milk, cocoa powder, vanilla extract, and salt until smooth.
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Remove the saucepan from the heat. Slowly sift in the powdered sugar, whisking constantly, until the frosting is smooth and no lumps remain. Let it cool slightly for 5-10 minutes.
7. Frost the Cake:
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Slowly pour the warm frosting over the slightly cooled cake with the marshmallow layer. Gently spread it into an even layer with an offset spatula or the back of a spoon.
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Let the cake sit for at least 30 minutes to allow the frosting to set before slicing and serving.
Chef’s Note: For clean slices, dip your knife in hot water and wipe it dry between cuts. This will easily slice through the gooey marshmallow layer.
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