April is a busy month filled with Easter, Spring Break, and two birthdays in our family!

It was the big #8 for our youngest son and we celebrated his special day with a special birthday cake and small family party!

I love making my children’s cakes and it makes their day when I create something just for them. But to keep my sanity it has to be an Easy DIY Birthday Cake. I was relieved when Little Boy requested a Baymax Birthday Cake because I immediately knew I could whip one up in a snap! This post may contain affiliate links marked with an asterisk. Click here for my complete full disclosure policy.

Baymax Easy DIY Birthday Cake: Supplies Needed

One Box of Cake Mix

Round Pyrex Casserole Dish*

Two Tubs of White Icing

Black Icing

Offset Spatula*

Baymax Easy DIY Birthday Cake: Instructions

Follow package instructions to mix up the cake batter. Coat a Round Pyrex Casserole Dish* generously with non-stick spray. Add the entire cake mix batter to the dish. Cook approximately 45-50 minutes until done.

I set my timer for 35 minutes then checked the cake every five minutes until the middle was no longer jiggly and a long wooden skewer came out clean.

Allow the cake to cool completely then across your fingers it comes out in one piece.

After you flip the cake onto a cake plate you will notice that rounded top of the cake is now on the bottom. Don’t let that gap around the bottom of the cake bother you. I’ve got a quick and easy fix for that!

To fill in the gap under the edge of the cake simply fill a plastic sandwich bag with icing, snip one corner, and use the handmade piping bag to pump icing to the gap.

Smooth the icing around the bottom of the DIY birthday cake with an Offset Spatula*. This fills in that gap between the cake and the cake plate. Easy peasy!

Ice the entire cake with white icing. For years I used a plain butter knife to ice my cakes. Now I’m in love with this Offset Spatula* for all my easy DIY birthday cake making. It makes it so much easier to ice the cakes. Plus the cakes look more professional when you use a real cake decorating tool instead of a kitchen knife.

Once the cake is iced it’s time to add Baymax’s trademark eyes. Since his eyes are basically just two circles connected with a line it is pretty simple. But I needed a template. A marker top makes an awesome circle for me to fill in with black icing!

Add a border around the bottom using the rest of the black icing and the easy DIY Baymax cake is finished!

Our son loved it SO much! He ran to his Disney Infinity figurine collection to grab Hiro and Baymax so they can join the party!

If you have a child who loves Big Hero 6 this is a Easy DIY Birthday Cake for you! From start to fix it our took me less than a couple of hours to make a unique birthday cake for our son!

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If you loved this birthday cake tutorial then you must see the rest of my Party Planning Tips and Tricks!

Click here to see SIX more Easy DIY Birthday Cake tutorials!

 Don’t forget to check out my Party Planning Pinterest Board for more inspiration!

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Full Disclosure: This post contains affiliate links and/or is a sponsored post. I may receive compensation in the form of monetary compensation or product compensation in exchange for my review. I take pride in reviewing only products that fit my brand and will be beneficial to my readers. And while this post is sponsored or contains affiliate links, all the opinions are my own. Why do I do this? It will help me keep this DIY’ing Mama crafting for another day! For more on my disclosure policy click here.