Prepare the Cake Batter:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and line two 9-inch round cake pans with parchment paper.
2. Mix Dry Ingredients: In a large bowl, sift together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
3. Add Wet Ingredients: Add the eggs, milk, vegetable oil, and vanilla extract to the dry ingredients. Mix until just combined.
4. Incorporate Boiling Water: Gradually add the boiling water to the batter, stirring until smooth. The batter will be thin, which ensures a moist cake.

Bake the Cake:

5. Divide and Bake: Divide the batter evenly between the prepared pans. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
6. Cool the Cakes: Allow the cakes to cool in the pans for 10 minutes, then transfer them to a wire rack to cool completely.

Prepare the Oreo Frosting:

7. Cream the Butter: In a large bowl, beat the softened butter with an electric mixer until light and fluffy.
8. Add Sugar and Cream: Gradually add the powdered sugar, alternating with the heavy cream, until the frosting reaches a spreadable consistency.
9. Incorporate Oreos: Fold in the crushed Oreo cookies and mix until evenly distributed.

Assemble the Cake:

10. Layer the Cake: Place one cake layer on a serving plate. Spread a thick layer of Oreo frosting over the top.
11. Add the Second Layer: Place the second cake layer on top and frost the entire cake with the remaining Oreo frosting.
12. Decorate: Garnish with whole Oreo cookies around the edges and sprinkle crushed Oreos on top for a decorative finish.