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Roasted Potatoes and Onions with Rosemary and Mustard
4.5 from 26 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 potato unpeeled, cut into approximately 1/2 inch cubes, red
  • 3 tablespoons extra-virgin olive oil
  • 1 tablespoon whole grain mustard
  • 1 tablespoon rosemary chopped, fresh
  • 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 (14%) Fiber 3g (12%) Sugar 2g (4%) Vitamin A 17IU (0%) Vitamin C 13mg (14%) Calcium 17mg (2%) Iron 1mg (6%)

Nutrition Facts

Serving: 8 servings

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.