How to make a Rainbow Layer Cake in 25 easy steps!
Don't be scared, I broke the steps WAY down, that's why there are so many. It's really not very hard at all. But first, a little backstory.
Last year, I (a terrible baker) pulled off a minor miracle: I made a fancy cake. And made it on the first try.
Two years prior, my daughter Josie's 1st birthday cake cracked down the middle and the icing bled:
Caroline's 1st birthday cake never made it out of the pan. It stuck to the inside and came out in huge chunks. Thank goodness for the grocery store bakery. I did manage a sloppy looking smash cake, made from broken cake remnants:
I didn't even try for Josie's or Caroline's 2nd birthdays, I bought store cakes both times. What can I say, I was feeling dejected from my previous attempts, and at that time in my life, I was tired. So tired. But for Josie's 3rd birthday, I decided to try again. I was determined to make a rainbow layer cake, and I really wanted to say that I had done it. I also didn't want to pay $100 for a cake. So, armed with a great list of tips from my cake baker friend Karen, I rolled up my sleeves, said a little prayer and had at it.
It turned out so puuurty! I was so relieved. I am not a baker, either by practice or at heart. But I wanted to look back and tell Josie that I made her rainbow cake, even if it was a total embarrassment. I have never needed things to be perfect with my kids; just meaningful and heartfelt. To my surprise, this cake turned out to be both!
Here are the instructions, complete with Tips You Shall Not Ignore. Please note: I don't bake. I don't think I have ever baked a cake from scratch in my life and I don't intend to use my kids' birthday cakes as a jumping off point. Hence the Betty Crocker stuff. Feel free to judge and scrunch up your nose at me, it really doesn't bother me. Substitute your own fancy from-scratch recipe if you are so inclined!
Rainbow Layer Cake
You will need:
- 3 vanilla or white cake mixes (I have been instructed to only use Betty Crocker)
- 4 containers vanilla frosting (again, Betty Crocker)
- whatever is on the back of the cake mix box (usually oil, eggs and water)
- food coloring (I used AmeriColor Gel Food Color 8 Pack Kit)
- your choice of decor
- cooking spray and a little flour for the pans
Tools:
- 2 Wilton Aluminum Performance 9 Inch Round Pans or the like. Please don't skimp on these and use those cheesy grocery store cake pans. After trying these, I am convinced they were crucial to my success! You can find them at most Michael's stores or here from Amazon.
- parchment paper
- a sharp knife
- a large offset spatula
- wire racks for cooling
- a 10" cake board
- a large silver foil cake board (see note below)
Steps:
1. Before you bake anything, put one of the pans on the parchment paper and trace around the bottom with a sharpie. Yes, it will mark up the pan a bit. No, that won't hurt anything. Make six of these circles total.
2. Cut out all six of these circles. These will go into the pans before you pour in the batter. Note: I almost skipped the parchment paper, because I thought it was only for professional baker types. But I am very glad I didn't; I forgot to add the parchment to the bottom of the pan for the orange layer, and it was a little fussy coming out of the pan. Don't skip the parchment!
3. Spray cooking spray on the bottom and sides of both cake pans and coat with flour until the bottom and sides are coated. Tap the excess flour out of both pans.
4. Place 2 of your parchment circles on the bottom of each of the 2 pans. Your pans are now prepped and ready to go.
5. Preheat your oven to the temperature indicated on the cake mix box.
6. Make the batter as directed, then split evenly between two bowls. You don't have to be exact on this, just eyeball it but try to keep it pretty close.
7. In one bowl, add your purple food coloring, one to two drops at a time. Mix and determine the color. My experience is that the color it looks in the batter is pretty much exactly the color it comes out in the baked cake, at least with the Americolor dyes. My friend tells me to use a toothpick to swirl the color around for a minute, then you can use a spoon to finish incorporating the food coloring. This prevents the food coloring from just globbing onto your spoon and staying there.
8. In the other bowl, do the same with the blue food coloring. Basically, you are making the layers two at a time in reverse rainbow order. Transfer the batter into the two pans.
9. Once the batter is in the pans, gently tap them on your counter to work out any air bubbles, then put them into the oven.
10. After 15 minutes, forget what your mother told you about heat escaping, open the oven and turn each pan 1/2 way around. It is fine, I promise.
11. Ok, this next step is muy importante. MUY! Check your cakes with a toothpick stuck in the middle 10 minutes BEFORE the minimum time that is on the box. So if the box tells you bake for 30 - 35 minutes, start checking at 20. If they are not ready, wait 2-3 minutes and check again. You are going for slightly crumbly in the middle. If it is wet still at all, leave them in another couple minutes. My oven does not run very hot at all and I took mine out a full 7 minutes earlier than the box indicated! This way, your cakes will not be too dry tasting and they are far less likely to crack. I did this trick with all six layers and NONE of them cracked -- formerly a huge problem for me.
12. When they are done, take them out and place them on top of the oven to cool for 10 minutes. Leave your oven on.
13. After 10 minutes, run a knife around the edges.
14. Your cakes will probably have puffed up in the middle. This is bad mojo for a six layer cake. You want a flat top. With the cake still in the pan, take a sharp knife and cut across through the puffed up part of the top, holding the knife as level as possible. Start small so you don't overdo it. Just keep going until it is as flat as you can get it. This was the most challenging part for me; but once I got the hang of it, it was no big deal. Oh and the part you cut off you should totally eat.
15. Spray your wire racks with a quick shot of cooking spray, put the racks face down on top of the cakes, then flip. If the cake pan seems to be sticking, lightly tap on the pan with your hand and it should come right out. Carefully remove the parchment paper and toss it. Let these two cakes cool while you make the next two layers.
16. Mix up the next cake mix as directed, split into your two bowls and dye them green and yellow, respectively. You don't need to wash the cake pans. Just spray and flour them again and line the bottom with your next two parchment circles.
17. Pour into the cake pans and bake -- don't forget to start checking it early! Repeat steps 12-15.
18. If you have enough wire racks, go ahead and make your last two layers, the orange and red layers. If not, they will have to wait while you free up some racks by transferring some of your layers to the cake board. To do this, flip the purple cake back into one of the cake pans. Place the cake board, shiny side down, onto the cake and center it. Then flip over again and remove the pan. Easy!
19. Frost the purple layer on just the top, not too thin and not too thick, just medium. Don't worry about the crumbs. Spread it almost to the edge.
20. Now, the second layer. This is one of those times when you have to have faith in yourself, because you will be picking it up and placing it on the purple layer. Have them right next to each other. Don't totally rush it but be quick and confident about it. It should not crack because it is pretty thin but just in case, don't overthink it or hesitate too much. You got this!
21. Frost the top of this layer just as you did the purple layer. Repeat with all the other layers until you finally put the red layer on top. Don't frost the red layer yet.
22. Now, the crumb coat. Yet another priceless tip!! A crumb coat is a super thin layer of frosting that catches all the crumbs you will encounter. Your "pretty" frosting will go on top of the crumb coat after it has set. To crumb coat: start with some frosting on the top and spread it very, very thin. THIN, people! Continue down the sides, being careful not to shift the cakes. Be gentle!
23. Once you have the crumb coat done over the whole cake, place it in the fridge for a half hour to set up.
24. After the half hour is up, use fresh icing to frost the rest of the cake. Start at the top middle and work out. Don't be stingy! Work your way down, then wipe around the bottom to clean it up.
25. The final look of the cake is totally up to you. I kept mine as smooth as possible, then added some shells around the base and swirls with strawberries on top as decoration. Some people have asked about the oversized nonpareils I used... I didn't think regular old tiny nonpareils would "hold up" to the size of the cake, so I got some Festival brand Grande Nonpareils at Hobby Lobby. If you don't have a Hobby Lobby, a comparable product would be the Wilton Jumbo Rainbow Nonpareils.
I then put a small dollop of icing on my large foil cake board and carefully - oh so carefully -- placed the finished cake (which was on the smaller cake board) on the center of it. This will hold the smaller cakeboard in place so it doesn't totally slide off your large foil cake board, taking the cake with it. Cause that would be bad, yo.
A note about cake boards: for my money, I would not skimp on the large foil cake board. That cake will be HEAVY. Having that big silver sturdy cake board will pay for itself by not only looking nicer, but by giving you a more solid base when you carry that bad boy out to your waiting crowd. They aren't very cheap, so if you'd like to save it to reuse, you can do what I did and use a smaller cardboard cake board under the cake to cut the cake on so the silver foil one doesn't get ruined from the knife. I hope that makes sense!
So there you have it, a no-fail, six-layer, very yummy rainbow cake! It was a little time consuming but not difficult, and it made a huge splash at the party, which is what you want from a giant rainbow cake I am assuming! Happy baking!
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