Preheat the oven to 350°F (175°C). Grease and flour a cake pan.

In a mixing bowl, cream together the butter and sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

In another bowl, combine the flour, cocoa powder, and baking powder. Gradually add to the creamed mixture, alternating with milk.

Pour the batter into the prepared cake pan and bake for 30 minutes or until a toothpick comes out clean.

Allow the cake to cool completely before frosting.

In a mixing bowl, beat together the butter and powdered sugar until smooth.

Add the milk and vanilla extract, mixing until the frosting is light and fluffy.

Divide the frosting into separate bowls and add food coloring to create different colors.

Spread a layer of frosting on top of the cooled cake.

Use the colored frosting to create fun designs, such as grass or dinosaur footprints.

Place dinosaur cake toppers on the cake and add candy eyes and sprinkles as desired.