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4.5 from 39 votes

Roasted Potatoes and Onions with Rosemary and Mustard

This Roasted Potatoes and Onions recipe is mixed with onions that caramelize, rosemary, and whole grain mustard that adds a subtle kick. The perfect side for anything from a casual weeknight dinner to Thanksgiving!

Prep Time
5 mins
Cook Time
1 hr
Total Time
1 hr 5 mins
Servings: 8 servings
Calories: 153 kcal
Course: Side Dish
Cuisine: American

Ingredients

  • 1 yellow onion quartered and sliced to approximately 1/4-inch thick (see notes)
  • 2.5 lbs red potatoes unpeeled, cut into approximately 1/2 inch cubes
  • 3 tablespoons extra-virgin olive oil
  • 1 tablespoon whole grain mustard
  • 1 tablespoon chopped fresh rosemary
  • kosher salt to taste
  • black pepper to taste

Instructions

    Cup of Yum
  1. Mix all ingredients in a large bowl (make sure you salt liberally!).
  2. Spread evenly on a sturdy rimmed baking sheet.
  3. Roast at 425 degrees for approximately 1 hour, stirring once halfway through, until potatoes are browned and onions crispy.

Notes

  • It's important to not overcrowd the pan. Use two baking sheets if needed, or cut the recipe in half.
  • The onions can cook a bit more than desired if sliced too thinly, and also I find if I'm using an electric oven (for some reason, gas never burned the onions for me, but when I switched to an electric one I had to keep a closer eye on it). If you're concerned about this or need to troubleshoot burnt onions, try slicing the onions a bit thicker or add them to the sheet pan a little ways into cooking the potatoes so they aren't in there the whole time.

Nutrition Information

Calories 153kcal (8%) Carbohydrates 24g (8%) Protein 3g (6%) Fat 6g (9%) Saturated Fat 1g (5%) Sodium 48mg (2%) Potassium 665mg (19%) Fiber 3g (12%) Sugar 2g (4%) Vitamin A 17IU (0%) Vitamin C 13mg (14%) Calcium 17mg (2%) Iron 1mg (6%)

Nutrition Facts

Serving: 8servings

Amount Per Serving

Calories 153

% Daily Value*

Calories 153kcal 8%
Carbohydrates 24g 8%
Protein 3g 6%
Fat 6g 9%
Saturated Fat 1g 5%
Sodium 48mg 2%
Potassium 665mg 14%
Fiber 3g 12%
Sugar 2g 4%
Vitamin A 17IU 0%
Vitamin C 13mg 14%
Calcium 17mg 2%
Iron 1mg 6%

* Percent Daily Values are based on a 2,000 calorie diet.