This one is very easy!
Take your white cake batter of choice (boxed or homemade – I used Betty Crocker for this one). Make one batch of cake batter, add a generous amount of food coloring, and bake in a large sheet pan. Be sure to add enough color because I went for a subtle pink and it ended up a little too subtle for my taste. Once that cake has cooled, use Mickey Mouse cookie cutters to cut Mickey heads out of the cake. Pop the heads in the freezer get them a little cool.
Make a second batch of cake batter, making sure NOT to add food coloring this time. Add a little batter to the bottom of your bundt pan and then take your Mickey heads out of the freezer and place them ears-down in a ring around the cake (so they look like they’re standing on their heads). Fill in the bundt pan with the rest of the white cake batter. The Mickey heads might float up a little, but don’t worry – the white batter will expand as it bakes and most of the Mickey heads will stay in place.
Bake the cake as usual. When you cool it, frost it, and slice it up – Mickey heads!