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Caramelized Onion Mashed Potatoes

Discover how to make mashed potatoes that are loaded with caramelized onions.
Course Side Dish
Cook Time 2 hours
Total Time 2 hours
Servings 0
Author Eric Samuelson

Ingredients

For the caramelized onions

  • 2 large onions your choice of type
  • 2-3 tbsp oil
  • salt to taste

For the mashed potatoes

  • 3 lbs potatoes (Russet, Gold, or Red)
  • 4 tbsp butter melted
  • ¼ to ½ cup whole milk or half & half room temperature
  • salt to taste

Instructions

To make the caramelized onions

  • Dice your onion if you are planning to use them mixed into recipes. Slice your onions if you are planning to use them on a burger or something you want large onions for.
  • Add the oil and onions to the cast iron pan. Add salt to taste. You are cooking the onions for a long time so not need to wait for the pan to heat up.
  • Cook over medium heat for 60-90 minutes. The amount of time it will take depends on the moisture content of the onion. You could even go lower if your stove top runs hot. You want them to just be barely cooking so that the onions break down slowly and gets brown.
  • Stirring the onions every once in a while. If they seem too dry, add a little more oil.
  • Once the onions look completely solid brown, they are done. They should be the same color brown all the way around.
  • Use immediately in a recipe or store in the fridge for 5 days or freeze for 6 months.

To make the mashed potatoes

  • Place the potatoes in a pot large enough to tit them all and cover them with just enough water. Bring to a boil.
  • Cook the potatoes until they reach an internal temperature of 2 degrees below the boiling point of water in your area (that changes based on elevation). If you don't have a thermometer then the potatoes need to be tender enough that a fork goes through them, but a thermometer is going to be most accurate. If cook the potatoes too long past this point they will become waterlogged and fall apart eventually.
  • Remove from water. If you are removing the skins, then rub the potatoes with a towel to remove the skin as soon as you can handle them.
  • Mash the potatoes in a large bowl. Add the butter and milk (or half and half) mix to combine, You can whip them with a hand mixer to help it all incorporate faster.
  • The final step is to salt to taste and fold in your caramelized onions.