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Rainbow Cake in a Jar

tbspErin Recipe by
(190 reviews)
Rainbow Cake in a Jar
  • Prep Time 40 min
  • Total Time 1 hr 20 min
  • Servings 3
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Rainbow Cake in a Jar

Pretty ROYGBIV layers blend together in these personal-size mini cakes that you bake right in the jar.


box Betty Crocker SuperMoist™ white cake mix
Water, vegetable oil and egg whites called for on cake mix package
Betty Crocker™ Food Color Gel Neon
Food coloring drops (yellow, red, blue)
container Betty Crocker™ Whipped fluffy white ready-to-spread frosting
wide-mouth glass canning jars (1 pint each)
Cooking spray


  • 1 Preheat oven to 350°F. Wash canning jars and dry thoroughly. Set lids and rims aside. Spray inside of each glass jar with a generous amount of non-stick cooking spray.
  • 2 Make cake batter according to directions on cake mix box. Divide batter evenly between 5 bowls (there will be slightly under 1 cup of batter in each bowl). If you have large measuring cups, these work great for making sure the amounts are even.
  • 3 Add food coloring in the following amounts to each bowl and stir to blend well. First bowl: 15 drops of neon pink food coloring. Second bowl: 14 drops of regular yellow food coloring. Third bowl: 24 drops of regular green food coloring. Fourth bowl: 24 drops of regular blue food coloring. Fifth bowl: 8 drops of regular red + 7 drops of regular blue + 3 drops of neon purple food coloring.
  • 4 Spoon about 1/4 cup of each color batter into each of the jars, layering the colors in this order: purple (first), blue, green, yellow, pink (last). Use a paper towel to wipe any spills or drips from the jars.
  • 5 Place the jars in a glass baking dish. Add 1/4 inch of water to the bottom of the dish surrounding the jars. Bake for 35-40 minutes. Cake tops should spring back to the touch when done, but don't bake so long that the cakes are brown. You can also use a long bamboo skewer to test doneness if you have one.
  • 6 Allow cakes to cool completely (about one hour) and before frosting and decorating as desired.
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Step By Step  

Happy Birthday, Tablespoon!

As prepared by tbspErin,

Happy 2nd Birthday, Tablespoon!

It's been two years since Tablespoon was born, and that was Team Tablespoon's cue to party!

Since the beginning, we've been totally committed to bringing rock-star recipes to you, and you've responded by telling us you love Tablespoon as much as we do! So we planned the awesomest party ever in honor of Tablespoon hitting its Terrific Twos.

Rainbows and unicorns were first on the invitee list. If you follow Tablespoon regularly, you know we love rainbows! There was no doubt that would be our theme.

Party in Motion

Check out this quick video to see how it all went down:

Tablespoon's 2nd Birthday Party from Tablespoon on Vimeo.

Rainbow Cakes in Jars

We're hosting a birthday party, and what better place to start than in the super awesome Betty Crocker Kitchens?! The team made a trip down to the Kitchens to make our Rainbow Cakes in Jars and stir up a color-coded mess.

Our first To Do was to make a humongo batch of amazing Rainbow Cakes in Jars for our guests. (Click recipe title or see recipe at end of post.)

Ready ...

Set ...



Here's our ninja Tablespoon team mixing up the cake batter in rainbowonderful colors.

Check it out -- a batter rainbow!

Then 1/4 cup of each color slowly slithered into each jar -- in rainbow-color order, of course.


First, our fearless leader, Erin, showed us the way. (Her nail polish even matches!)


Angela, project manager for the Rock UR Party channel ...


Nathan, project manager for the Taste for Adventure channel ...


Susan, project manager for the Quick Dish channel ...


Elizabeth, Tablespoon's newsletter planner ...


It worked! We were pretty proud ...

Karen, a test kitchen technician in the Betty Crocker Kitchens, helped us bake our cakes to spectrum perfection.


(Well, actually Karen made most of the 30-some cakes, but we're claiming helper dibs!)


Just for kicks, we slid one cake out of the jar when it was done and took a peek inside ... Whoa! Serious awesome sauce!


Each cake got a cap of whipped frosting and a sprinkle of rainbow dust and they were ready to rock our party!


They're ready!


Check out the BEST. CANDLES. EVER.


Groovy Gifts for Our Guests

We assembled gift bags -- packed full of rainbow-colored loot and topped with rainbow brights ...


 Making the Betty Room Beautious

We dolled up the Betty Crocker Portrait Kitchen -- the scene of the par-tay. Portraits of the Betty Crockers throughout the years make this room special already. We just added some happy hues!


The Bettys looked on as we colorized the room. Think they approved?


Color It and They Will Come

The room was ready -- and it was on fire with color!


Our Guests Arrived!

Everyone here has something to do with Tablespoon's success!

Happy Birthday, Tablespoon!

Erin welcomed everyone, wished Tablespoon a happy birthday and then dug in ... YUM!


What's a Party Without Food?

We're Tablespoon, so you know there were eats and treats at this soiree! Even the food was color-wonderful ...


What's a Party Without a Game?

Pin the tail on the donkey? No way! Pin the horn on the unicorn!

Jeanette takes a stab at it ...


We all had an awesome time and couldn't believe it went so fast. From all of us at Tablespoon, thank you for making our first two years so amazing! Keep cooking up a storm and sharing your recipes on!

We <3 TBSP!


Team Tablespoon

Front row: Nathan, Erin | Back row: Sara, Elizabeth, Angela, Susan

Featured recipe: Rainbow Cake in a Jar

Thanks to Tablespoon's newest blogger, Brooke McLay, for the original idea and recipe for this post! Find her Rainbow Cake in a Jar article on
See Recipe

Goodness knows we love a good rainbow dessert recipe at Tablespoon, and these cute layered mini cakes are no exception! They look impressive, but they're easier to make than you'd think. The hardest part is coloring and layering the batter, and that's not even hard. (Don't you love it when the easy recipes are the most impressive looking?) We tested this recipe multiple times, and here are the tricks we picked up for guaranteeing rainbow cake success: • Batter amounts: it's definitely easiest to divide the batter into five equal batches for coloring, but we did find the bottom (purple) layer looked thicker than the others after baking. Basically, every time you pour in a new color, it kind of sinks to the bottom/center (gravity in action!) and pushes the batter that was already there up and out. So even though there's the same amount of each color batter, whatever one you put in first gets distributed up the sides of the jar more than the others. You may want to try tweaking the amounts of each color for a perfectly even rainbow, but we dig the tie-dye effect that naturally occurs when layering the colors. • Bake time: ovens vary, but we found we needed the full 40 minutes of bake time. You don't want the cakes to be over-done, but as long as they don't start to brown on top you should be okay. • Deflate-gate: as the cakes cool they sink in the jar just a little bit. Don't worry if this happens! It's just moisture escaping as things cool down, and it's totally okay.

Nutrition Information 
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