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Preheat oven to 350 degrees.
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Grease a sheet pan with cooking spray and set aside. (I use an 11 x 17 jelly roll pan.)
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In a large mixing bowl, whisk together sugar, flour, baking soda, and salt.
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In a separate bowl, whisk together eggs, buttermilk, and vanilla extract. Set aside.
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In a small sauce pan, melt the butter on medium-low heat.
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Whisk in the cocoa powder and hot water.
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Turn up the heat to medium-high and bring the mixture to a boil.
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Add the melted butter mixture to the dry ingredients and mix until smooth.
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Stir in the milk mixture and mix until ingredients are combined.
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Stir in the chopped Oreo cookies.
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Pour the batter into the prepared sheet pan and spread evenly.
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Bake the cake for 17-19 minutes, or until a toothpick inserted in the middle comes out clean.