Make rainbow cupcakes in a jar. This rainbow cupcake recipe has a couple easy tricks to make these colorful mason jar rainbow cakes.

Wouldn’t it be fun to serve these Rainbow Cupcakes for a fun St Patrick’s Day dessert? We made this rainbow in a jar St Patrick’s Day treat from a boxed cake mix to celebrate a day when we all wish to be Irish. I have always had so much fun with St. Patricks Day, from giving my son green milk to sticking clovers in my girl’s hair. I never wish to pass a chance to have some fun even if all the kids are grown. And this Mason Jar Rainbow Cupcake looks like a rainbow in a jar, what fun right?

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We are loving all the bright bold colors on these. These mason jar rainbow cakes e are better than finding gold at the end of the rainbow, they are so pretty and make a delicious St Patrick’s Day Treat.

What you need for mason jar rainbow cakes:

Ingredients:

Box of White Cake Mix plus ingredients to make the cake
Food Colors
White Frosting

Equipment Needed

Mixing Bowls
8- 8 ounce Mason jars
9 X 13 pan
Cake Tester, optional
St Patricks Day Toppers
St Patrick’s Day Sprinkle Mix

How to make rainbow cupcakes in a jar:

Instructions:

Spray the inside of the mason jars with a nonstick baking spray and preheat the oven to 350° F. Prepare the cake mix according to package directions. Divide the cake batter evenly into 5 separate bowls. (about 1/2 cup of batter in each bowl).

Add different food colors to each of the bowls and mix well to achieve bright bold colors. Carefully drop blobs of the different colored batter into your prepared jars filling the jars about halfway.

Place jars in a 9 X 13 pan and fill with about 1/4 to 1/2 inch of water. Bake for 45-50 minutes until done. You can test for doneness by using a Cake Tester. Remove from the 9 X 13 pan of rainbow cupcakes and water bath from the oven. Remove the jars from the water and place on a rack to cool.

Once the cupcakes are cool, frost the tops and decorate with St. Paddy’s Day Cupcake Toppers and/or green sprinkles. These Rainbow Cupcakes really take the cake. (pun intended).

This Rainbow in a jar was a fun little challenge and so delicious. And your could use a variety of colors. Wouldn’t it be fun to make white red cupcakes for Valentines Day or Christmas?

Other St Patrick’s Day Recipes and Fun:

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Print Recipe

5 from 14 votes

Mason Jar Rainbow Cake Recipe

Make Mason Jar Rainbow Cupcakes that look like a rainbow in a jar. Our rainbow cupcake recipe show steps on how to make rainbow cake or mini mason jar cake.

Prep Time15

Cook Time40

Total Time55

Course: Dessert

Cuisine: American, Irish

Keyword: Mason Jar Cupcakes, mason jar rainbow cake, Rainbow Cupcake recipe, rainbow cupcakes in a jar., Rainbow in a Jar

Servings:

Calories: 240kcal

Author: Evelyn

Equipment

Non stick Baking Spray
Mixing Bowls
8 8 oz Mason Jars
9 X 13 baking pan
Cake Tester optional
St Patricks Day Toppers optional
Green Sprinkles shamrocks, clovers (optional)

Ingredients

1 box white cake mix plus ingredients to make cake
food coloring several colors
white frosting whipped

Instructions

Spray the inside of the jars with a non stick baking spray and preheat the oven to 350 degrees F.
Prepare the cake mix according to package directions.
Divide the cake batter evenly into 5 separate bowls. (about 1/2 cup of batter in each bowl).
Add different food colors to each of the bowls and mix well to achieve bright bold colors.
Carefully drop blobs of the different colored batter into your prepared jars filling about halfway.
Place jars in a 9 X 13 pan and fill with about 1/2 inch of water.
Bake for 45-50 minutes until done. You can test for doneness by using a cake tester or long toothpick
Remove from the oven and water bath and let cool.
Once the cupcakes are cool, frost the tops and decorate with Cupcake Toppers or Sprinkles