To make the rainbow birthday cake, you will need flour, sugar, eggs, butter, milk, baking powder, food coloring, and frosting. You may also need additional decorations like sprinkles or edible glitter.

The rainbow birthday cake has multiple layers, each dyed a different color to create the beautiful rainbow effect.

Yes, you can customize the colors of the cake layers to your preference. Use food coloring to achieve the desired shades for each layer.

Stack the cake layers in the order of the rainbow colors: red, orange, yellow, green, blue, and purple. This will ensure the cake looks vibrant and true to the rainbow theme.

A simple buttercream frosting works well for the rainbow birthday cake. It can be easily colored to match the cake layers and provides a smooth finish.

Absolutely! You can add various decorations such as sprinkles, edible glitter, or even small candies to enhance the appearance of the cake and make it more festive.

The baking time for each layer of the rainbow birthday cake typically takes around 20-25 minutes. The total time will depend on how many layers you are making.

If you're missing some ingredients, you can often find substitutes. For example, you can use vegetable oil instead of butter, or yogurt instead of milk. Just adjust the recipe accordingly.