Preheat your oven to 350°F (175°C) and grease two 9-inch round cake pans and one small oven-safe bowl (for the 'burger bun' top).

In a medium bowl, whisk together flour, baking powder, baking soda, and salt.

In a large mixing bowl, cream together the butter and sugar until light and fluffy. Add eggs one at a time, beating well after each addition, and mix in the vanilla extract.

Gradually add the dry ingredients to the wet ingredients, alternating with the milk, starting and ending with the dry ingredients. Mix until just combined.

Divide the batter into three portions: one large portion colored golden yellow (for the bun), one smaller portion colored brown (for the burger patty), and a third portion red (for the 'tomato').

Pour the yellow batter into one round cake pan and the small bowl, pour the brown batter into the second round cake pan, and pour the red batter into a smaller cake pan or sectioned muffin tin. Bake the cakes for 25–30 minutes, or until a toothpick inserted into the center comes out clean. Let cool completely.

Once cooled, level the tops of the cakes with a serrated knife for stacking. Start by placing the 'burger patty' (brown cake) on a serving plate.

Spread chocolate frosting over the brown cake to resemble the texture of a burger patty. Layer the red cake on top and spread whipped cream or green-colored frosting lightly over it to mimic lettuce.

Carefully place the larger yellow cake on top as the bottom bun. Use vanilla frosting to adhere the smaller yellow cake dome on top as the upper bun.

Sprinkle crushed cookies over the dome-shaped bun to resemble sesame seeds. Use fondant or additional frosting to craft decorative lettuce, cheese slices, or other burger toppings as desired.

Chill the assembled cake for 30 minutes before serving to allow the layers to set.