In my version of Potatoes O’Brien I stick to the classic American approach—diced potatoes, red and green bell peppers, onions, olive oil, and a few simple spices—but I roast everything in the oven for maximum flavor and ease. Oven roasting creates those crisp, golden edges on the potatoes while keeping the centers tender and fluffy, making this dish perfect for breakfast, brunch, or as a hearty side for dinner.
I’m a devoted potato fan—whether mashed, roasted, or pan-fried, potatoes are one of my favorite comfort foods. While some recipes like a potato pie take more time and technique, Potatoes O’Brien is intentionally simple: peel and cube the potatoes, add diced bell peppers and onions, season, and roast. I prefer the oven method over a skillet because it requires less hands-on attention and yields consistent caramelization across the vegetables.
Table of Contents
- Sommer’s Recipe Highlights
- Key Ingredients and Tips
- How to Make
- Serving Suggestions
- Storage Notes
- Frequently Asked Questions
- More Side Dish Recipes
Sommer’s Recipe Highlights
Simple, vegetable-forward dish – No dairy, eggs, or meat required. This recipe is naturally vegetarian and easily vegan and gluten-free. It relies on fresh produce, oil, and basic seasonings.
Hands-off roasting – Most of the cooking time happens in the oven. Prep takes about 20 minutes; roasting is roughly 25 minutes for a total time of about 45 minutes. A single flip halfway through is all that’s needed to get even browning.
Versatile side – The bright peppers and savory onions pair well with breakfast proteins like eggs and sausage and also complement grilled or spiced meats for dinner. The flavor leans slightly toward Tex-Mex when served with complementary mains.
Key Ingredients and Tips
- Potatoes – Russets or other starchy potatoes hold up well when cubed and roast to a crisp exterior and fluffy interior. Cut into uniform ½-inch cubes for even cooking.
- Bell peppers and onion – Use a mix of red and green bell peppers for color and balanced sweetness. A yellow onion is a good choice for its mild, sweet flavor.
- Seasoning – Garlic powder, salt, and black pepper are all you need for classic flavor. Adjust to taste or add smoked paprika for a smoky note.
- Olive oil – Use a high-heat oil like extra-virgin olive oil, avocado oil, or canola oil to coat the vegetables for roasting.
- Fresh herbs – A sprinkle of chopped parsley or sliced green onions just before serving brightens the dish and cuts through the richness of roasted vegetables.
How to Make
Find ingredient amounts, a printable version, and a short video demonstration in the recipe card below.
1. Prep the potatoes and veggies – Preheat the oven to 450°F (232°C). Peel and dice potatoes into roughly ½-inch cubes, aiming for even sizing so all pieces cook at the same rate. Place diced potatoes in a bowl of cold water as you work to prevent browning. Dice the bell peppers and onion to similar sizes.
2. Dry the potatoes – Drain the cubed potatoes in a colander and pat them thoroughly dry with paper towels. Excess moisture will steam the potatoes in the oven and prevent the desirable crisping and caramelization.
3. Season and oil – Spread the dried potato cubes, peppers, and onion across a large rimmed baking sheet. Sprinkle evenly with salt, ground black pepper, and garlic powder, then drizzle with olive oil. Toss the vegetables so every piece is lightly coated.
4. Roast – Arrange the vegetables in a single layer so pieces are not overlapping. Roast for 15 minutes, remove the sheet and use a spatula to flip and redistribute the pieces so different sides can brown. Return to the oven and roast another 10–15 minutes, depending on how golden you want them. They’re done when the largest potato pieces are easily pierced with a fork and the edges are crisp and brown.
5. Finish and serve – Let the roasted Potatoes O’Brien cool briefly on the baking sheet, then scatter chopped parsley or sliced green onions over the top and serve warm.
Serving Suggestions
Potatoes O’Brien makes an excellent savory side for breakfast and brunch, pairing beautifully with eggs, breakfast sausage, or steak. For dinner, treat it as a Tex‑Mex or Southwestern-inspired side alongside grilled or spiced proteins. Some classic pairings:
- Steak and eggs or other hearty breakfast proteins
- Sunny-side or over-easy eggs for a quick brunch
- Grilled or blackened chicken, steak tacos, or smoked pork chops for dinner
Storage Notes
O’Brien potatoes are best right out of the oven, when they are crisp outside and soft inside. Leftovers keep well for 3–4 days in an airtight container in the refrigerator. Reheat in the oven at 400°F for 10–15 minutes or in an air fryer at 375°F for about 5 minutes, shaking or turning once; this restores crispness. Avoid the microwave, which can make roasted vegetables soggy by releasing extra moisture.
Frequently Asked Questions
Yes. If using frozen diced potatoes, do not thaw them first because thawing releases moisture and prevents crisping. Toss frozen cubes on the baking sheet and season as usual; expect a longer roast time, typically closer to 30–35 minutes total, to reach fork-tender doneness.
Soggy roasted potatoes usually result from excess moisture—either from not drying the potatoes after draining, adding too much oil, or overcrowding the pan so pieces steam instead of roast. Dry the potatoes thoroughly and spread everything in a single layer on a large rimmed baking sheet for best results.
A good nonstick or well-seasoned rimmed baking sheet works best. Parchment typically has a heat limit and can discolor at very high temperatures, and foil may cause the vegetables to stick. If you prefer easier cleanup, use a heavy-duty sheet and a light coating of oil; otherwise, roasting directly on the pan promotes better browning.
Enjoy this simple, flavorful side. Roasting makes Potatoes O’Brien an easy way to bring texture and color to any meal.
More Side Dish Recipes
Crispy Potatoes
Sweet Potato Hash (Potatoes O’Brien Variation)
Skillet Potatoes
Air Fryer French Fries
Potatoes O’Brien
Roasting potatoes, peppers, and onions produces crispy, golden-brown Potatoes O’Brien with minimal effort. This simple recipe highlights fresh vegetables, basic seasonings, and a short oven roast for great texture and flavor.
Ingredients
- 4 cups diced potatoes (½ inch cubes)
- 1 cup diced green bell pepper
- 1 cup diced red bell pepper
- 1 cup diced onion
- 2 teaspoons salt (adjust to taste)
- 1 teaspoon ground black pepper
- 1 teaspoon garlic powder
- 2 tablespoons olive oil
- 2 tablespoons chopped parsley or sliced green onions, for garnish
Instructions
- Preheat the oven to 450°F. Peel and dice potatoes into ½-inch cubes. Place diced potatoes in a bowl of cold water to prevent browning as you work.
- Dice the bell peppers and onion. Drain the potatoes in a colander and pat dry with paper towels until the pieces are as dry as possible.
- Place the potatoes, peppers, and onions on a large rimmed baking sheet. Sprinkle with salt, black pepper, and garlic powder, then drizzle with olive oil. Toss to coat evenly.
- Spread the vegetables in a single layer. Roast for 15 minutes, then flip and continue roasting for another 10–15 minutes until the pieces are golden and crisp. Test the largest potato cubes with a fork; they should be tender inside. Garnish with parsley or green onions and serve warm.
Notes
These potatoes are best right after roasting when they are crispiest. Store leftovers in an airtight container in the refrigerator for 3–4 days. Reheat in a 400°F oven for 10–15 minutes or in an air fryer at 375°F for about 5 minutes for the best texture. Avoid reheating in a microwave to prevent sogginess.
Nutrition
Serving: 6 oz • Calories: 66 kcal • Carbohydrates: 6 g • Protein: 1 g • Fat: 5 g • Sodium: 779 mg • Fiber: 2 g • Vitamin C: 56 mg