Preheat Oven: Preheat your oven to 350°F (180°C). Grease and flour two 9-inch round cake pans.
Mix Dry Ingredients: In a large mixing bowl, combine the sugar, flour, cocoa powder, baking powder, baking soda, and salt.
Add Wet Ingredients: Add the eggs, milk, vegetable oil, and vanilla extract to the dry ingredients. Beat on medium speed for 2 minutes. Then, stir in the boiling water (the batter will be thin).
Bake the Cake: Pour the batter evenly into the prepared cake pans. Bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean. Allow the cakes to cool in the pans for 10 minutes before transferring them to wire racks to cool completely.
Prepare the Frosting: In a medium bowl, beat the softened butter and cocoa powder together until well combined. Gradually add the powdered sugar and milk, beating until smooth and spreadable. Stir in the vanilla extract.
Assemble the Cake: Once the cakes are completely cooled, place one layer on a serving plate. Spread a generous amount of frosting on top, then place the second layer on top and frost the top and sides of the cake.
Serve: Slice and enjoy your delicious Hershey's Chocolate Cake!
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