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These blue mashed potatoes use a delicious natural coloring you can get anywhere. Perfect for July 4th.

Blue Mashed Potatoes

With Independance Day coming up, these blue mashed potatoes will wow your guests, both with their creamy buttery flavor and their patriotic hue. Oh yea... and did I mention they're BLUE?
Course Sides
Cuisine American, Irish
Level Beginner
Main Ingredient Potato, Vegetable
Diet Gluten-Free, Low Sugar, Pescatarian, Vegetarian
Prep Time 5 minutes
Cook Time 30 minutes
Total Time 35 minutes
Servings 4 servings
Calories 221 kcal


  • 600 grams potatoes
  • 120 grams red cabbage (tough stems removed)
  • 1 cup milk
  • 1/2 teaspoon salt
  • 50 grams cultured unsalted butter
  • 1/8 teaspoon baking soda


  1. Boil the potatoes skin-on until you can easily slide a toothpick through one.
    Boil the potatoes for the blue mashed potatoes.
  2. Slice the cabbage into thin strips and then add them to another pot, along with the milk and salt, and bring the mixture to a boil.
    Boil the red cabbage in milk to extract the color for the blue mashed potatoes.
  3. Turn down the heat and simmer until the cabbage is very tender and the milk is a vibrant purple (about 20-25 minutes).
    The milk for the blue mashed potatoes is done when it's a vibrant purple and the cabbage is tender.
  4. Add baking soda a little bit at a time until the mixture reaches your desired shade of blue. Don't add more than 1/8 teaspoon though as too much will make your mashed potatoes taste metallic. Add the butter and melt.
    Add the baking soda to the milk. This turns the color from purple to blue.
  5. When the potatoes are tender, mash them.
    Mash the potatoes, or pass them through a potato ricer.
  6. Add the blue cabbage and milk mixture to the potatoes and stir everything together until the blue mashed potatoes are creamy and uniform in color.
    Stir-in the blue cabbage and milk mixture to turn the mashed potatoes blue.
Nutrition Facts
Blue Mashed Potatoes
Amount Per Serving
Calories 221 Calories from Fat 108
% Daily Value*
Fat 12g18%
Saturated Fat 7g35%
Cholesterol 32mg11%
Sodium 372mg16%
Potassium 751mg21%
Carbohydrates 23g8%
Fiber 4g16%
Sugar 4g4%
Protein 6g12%
Vitamin A 440IU9%
Vitamin C 28.1mg34%
Calcium 129mg13%
Iron 5mg28%
* Percent Daily Values are based on a 2000 calorie diet.