Roasted Potatoes and Onions

Roasted Potatoes and Onions, an easy baked potato and roasted caramelized onion vegetable combination recipe that has 5 ingredients and is done in 40 minutes.

roasted onions and potatoes on a white plate with a gold fork

Love roasted potatoes? Love roasted onions? Bake them together! Roasting sliced potatoes and onions makes for a super tasty side dish recipe that’s packed with flavor from the crunch of golden brown potatoes and the sweetness of roasted and caramelized onions.

👉 Ready to learn how to roast potatoes and onions together? Let’s do it!

🧅 Ingredients you’ll need

This recipe requires just a few simple ingredients, including the following:

  • Potatoes: Available all year round in most regions, we chose small new potatoes, but red or fingerlings are great as well
  • Onions: Any onions will do, but we like yellow onions or red onions for their sweeter flavor when roasted
  • Olive oil: Brings out the flavor of vegetables when roasted and helps them to crisp when heated
  • Fresh herbs: Any fresh herbs will do, but we love fresh thyme, oregano, sage, and basil (dried herbs can work as well)
  • Seasonings: Garlic, salt, and pepper are the main seasonings in this recipe
  • Recommended tools: sheet pan, knife set, cutting board
potatoes, red onions, garlic, olive oil, salt, and pepper on a white table
Ingredients: potatoes, red onions, garlic, oil, salt, pepper

🥣 How to make (step-by-step photos)

1️⃣ Step One: Preheat oven and prep potatoes and onions

First, preheat the oven to 400 degrees F (200 C), the wash and cut the vegetables.

  • How to cut potatoes: Cut into 1 inch pieces, which means either halving or quartering the potatoes (depending on their size)
  • How to cut onions: Depending on their size, cut the onion in half and then into thin slices

👉 Cutting Tip: We like to cut different vegetables into similar sized pieces so they’re easier to eat when roasted. If they’re the same size, they will have similar cooking times and will be extra crispy!

sliced potatoes and red onions on a wood cutting board
Slice potatoes and onions

2️⃣ Step Two: Season potatoes and onions

Add potato and onions slices to a roasting pan and toss with olive oil until it completely covered.

Combine the oiled vegetables with sliced garlic, salt, pepper and your desired herbs (fresh or dried), then spread the herbs out onto a roasting pan.

sliced potatoes and onions on a roasting pan before baking
Add oil and seasonings

3️⃣ Step Three: Roast vegetables until golden brown

Cook veggies in the oven until tender and golden brown. Depending on your oven, this will take about 40 minutes.

Toss the onions and potatoes about 20 minutes in to make sure they cook evenly.

Remove the baking sheet from the oven and enjoy immediately as a side dish. To save for later, cool and then store (see storing instructions below).

roasted onion and potatoes slices on a baking sheet after roasting
Bake until golden brown, about 40 minutes

🌿 Flavor ideas

Get creative with your herbs and seasonings with these flavor ideas:

  • Add garlic and pesto: Combine potatoes and onions with garlic and a dollop of pesto (try Carrot Top Pesto to reduce food waste!)
  • Rosemary, salt, and pepper: Sprinkle fresh or dried rosemary over the vegetables, then add some salt and pepper to taste.
  • Thyme, fresh basil, and lemon juice: Add new depths of flavor by mixing with thyme, then finishing them off with some fresh basil leaves and a squeeze of lemon juice.
  • Parmesan and garlic: Potatoes and onions taste great with a mixture of parmesan and garlic. You can also try nutritional yeast for a plant-based cheese alternative.
baked onions and potatoes side dish on a white table

🧊 How to store

If you have leftovers, here’s how to maintain their quality and flavor in storage:

  1. Refrigerator storage: Store vegetables in an airtight container in the refrigerator for up to 3-4 days
  2. Freezer storage: For the best taste and texture, we don’t recommend freezing roasted vegetables as they will lose their texture when thawed

♻️ Sustainable kitchen tips

We’re all about going green in the kitchen here at Fork in the Road. Here’s how to make this recipe sustainably:

Take advantage of potato and onion seasons. The best time to make this recipe is when both potatoes and onions are at the height of their growing season. In most parts of the US, both are actually available year round. Find out when they’re in season in your area here.

Grow the veggies in your garden. Onions and potatoes are fairly easy to grow on your own, even in smaller containers. This is a great step toward a sustainable lifestyle!

a close up of roasted potato and onions on a white plate

👉 More roasted potato and onion recipes

Looking for more recipes with baked onions and roasted potatoes? Try our other favorites:

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Get my 4-Day Plant-Based Meal Plan to start your journey on the plant path.

baked onions and potatoes side dish on a white table

Roasted Potatoes and Onions Recipe

Kristina Todini, RDN
Roasted Potatoes and Onions, an easy baked potato and roasted caramelized onion vegetable combination recipe that has 5 ingredients and is done in 40 minutes.
5 stars (2 ratings)
Prep Time 5 minutes
Cook Time 40 minutes
Total Time 45 minutes
Course Salads + Side Dishes
Cuisine American
Servings 4 servings
Calories 144 kcal


  • 1 pound potatoes new, red, fingerling
  • 2 medium onions red or yellow
  • 1 tablespoon olive oil
  • 2 cloves garlic sliced
  • ¼ cup fresh herbs or 2 tablespoons dried herbs
  • 1 pinch salt and pepper


  • Preheat oven and prep veggies: Preheat oven to 400 degrees F (200 C), then wash and cut vegetables. Slice potatoes into 1 inch pieces, either by halving or quartering (depending on potato size). To cut onions, cut the onion in half and then into thin slices.
  • Season vegetables: Place sliced potatoes and onions on a sheet pan and combine with a drizzle of olive oil. Once completely coated in oil, season the vegetables with sliced garlic, salt, pepper and any dried or fresh herbs.
  • Roast vegetables: Bake onions and potatoes in the oven until soft and brown around the edges, which will take about 40 minutes. At about 20 minutes into cooking, toss the vegetables so they brown on all sides. Remove from the oven and serve immediately as a side dish, or let them cool and mix into salads.


  • Tools needed: sheet pan, knife set, cutting board
  • Prep ahead: Wash and cut vegetables in advance to reduce prep time before cooking.
  • Leftovers and storage: Vegetables should be stored in an airtight container in the refrigerator for up to 3-4 days. For best taste and texture, do not freeze and reheat.
  • Nutrition notes: Nutrition information is estimated for only ingredients in the recipe, not the additional spice options given. This simple roasted potatoes and onions recipe is a good source of fiber, vitamin A, vitamin C, and potassium.


Serving: 1servingCalories: 144kcalCarbohydrates: 26gProtein: 3gFat: 4gSaturated Fat: 1gPolyunsaturated Fat: 0.4gMonounsaturated Fat: 3gSodium: 21mgPotassium: 585mgFiber: 4gSugar: 3gVitamin A: 319IUVitamin C: 32mgCalcium: 34mgIron: 1mg
Keyword roasted onions, roasted potatoes
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