Steps
1. Preheat the oven to 350°F (180°C) and grease a cake pan.
2. In a mixing bowl, combine flour, sugar, cocoa powder, baking powder, baking soda, and salt.
3. Add milk, vegetable oil, egg, and vanilla extract. Mix until well combined.
4. Stir in boiling water until the batter is smooth.
5. Fold in crushed Oreo cookies.
6. Pour the batter into the prepared pan and bake for 30-35 minutes.
7. Let the cake cool, then decorate with whipped cream and Oreo cookies.