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+ servings
cake in a jar with frosting on top and sprinkles

Mason Jar Rainbow Cake

If you have a cake mix and some mason jars, you can create this fun and easy dessert! Mason jar cakes are a great way to send treats to someone you love!
Course Dessert
Cuisine American
Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings 4 servings
Calories 395kcal


  • 1 box white cake mix, prepared according to package directions
  • Food coloring
  • 4 one pint canning jars
  • 1 recipe for homemade buttercream frosting (or frosting of your choice)
  • Sprinkles


  • Preheat oven to 350 degrees. Spray the inside of each jar with nonstick cooking spray and set aside.
  • Divide batter evenly between five small bowls. Tint each bowl of cake batter with plenty of food coloring until nice and bright. I used red, yellow, orange, green, and blue to make a rainbow effect.
  • Spoon batter into jars, layering one color at a time. Make sure the jars are only filled about 2/3 of way to allow for expansion while baking. Place the 4 jars in a shallow baking dish, and add about 1/4 inch of water to the bottom of the baking dish. Place in the oven and bake for 30-35 minutes. Be sure to watch them carefully so they don't get too brown!
  • Remove jars and allow to cool completely. The cakes will expand while baking, so you will need to scoop out a small portion from the top of each cake before adding frosting. Add on frosting and sprinkles. Serve immediately or cover with a lid and store in the fridge. Enjoy!


*Nutrition facts do not include frosting ingredients.
Adapted from: Six Sisters' Stuff


Calories: 395kcal | Carbohydrates: 86g | Protein: 4g | Fat: 3g | Saturated Fat: 2g | Sodium: 736mg | Potassium: 65mg | Fiber: 1g | Sugar: 44g | Calcium: 233mg | Iron: 2.1mg