25-Min Chimichurri Flank Steak with Crispy Fingerling Potatoes – Fast, Fresh, and Flavor-Packed

This is the kind of weeknight dinner that makes you feel like you cheated the system. In just about 25 minutes, you’ll have juicy, seared flank steak topped with a bright, garlicky chimichurri and a tray of crispy fingerling potatoes. It’s simple, bold, and totally satisfying.

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No fancy techniques, just a few fresh ingredients doing their best work. If you love a meal that tastes like a special occasion but comes together fast, this one’s for you.

What Makes This Special

Chimichurri is the kind of sauce that wakes up everything it touches. It’s fresh, tangy, herby, and it turns a quick-seared steak into something restaurant-worthy.

Flank steak is ideal here because it cooks fast and slices beautifully when cut against the grain.

Fingerling potatoes crisp up like a dream with just a little oil and salt. They’re golden on the outside, creamy inside, and a perfect match for the zippy sauce. Best of all, you can cook the potatoes while you sear the steak, so the whole meal lands on the table at the same time.

Shopping List

• 1 to 1.5 lb flank steak
• 1.5 lb fingerling potatoes, halved lengthwise
• Olive oil (about 6–8 tablespoons total)
• Kosher salt and black pepper
• Fresh parsley (1 cup, packed)
• Fresh cilantro (1/2 cup, packed; optional but recommended)
• Fresh oregano (1–2 tablespoons) or 1 teaspoon dried oregano
• Garlic (3–4 cloves)
• Red wine vinegar (2–3 tablespoons)
• Red pepper flakes (1/4–1/2 teaspoon, to taste)
• Neutral oil for searing (avocado, canola, or grapeseed)
• Optional add-ins: lemon, lime, shallot, smoked paprika

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Step-by-Step Instructions

1. Heat the oven and prep the potatoes. Preheat your oven to 450°F (232°C).Halve the fingerlings lengthwise and toss them on a sheet pan with 2 tablespoons olive oil, 1 teaspoon kosher salt, and a few grinds of black pepper. Arrange cut-side down for maximum crisp.
2. Roast until golden. Bake for 18–22 minutes, flipping in the last 5 minutes if you want extra color. They’re done when the cut sides are deep golden and the centers are tender.
3. Make the chimichurri. Finely chop parsley, cilantro, and oregano.Mince the garlic. In a bowl, combine herbs, garlic, 2–3 tablespoons red wine vinegar, 1/2 cup olive oil, 1/4–1/2 teaspoon red pepper flakes, 1/2 teaspoon kosher salt, and a few cracks of black pepper. Stir and taste.Adjust with more vinegar for brightness, salt for punch, or oil for a looser texture.
4. Season the steak. Pat the flank steak dry. Rub with 1 tablespoon olive oil, 1–1.5 teaspoons kosher salt, and black pepper. Optional: add a light sprinkle of smoked paprika for color and warmth.
5. Preheat the pan. Heat a large cast-iron or heavy stainless skillet over medium-high until very hot.Add 1 tablespoon neutral oil and swirl to coat.
6. Sear the steak. Lay the steak in the pan and press gently for even contact. Sear 3–4 minutes on the first side without moving it. Flip and cook 2–4 minutes more for medium-rare (125–130°F).Adjust time based on thickness.
7. Rest the steak. Transfer to a cutting board, tent loosely with foil, and rest 5–7 minutes so the juices settle. Don’t skip this step.
8. Finish the potatoes. Pull the potatoes from the oven. Toss with a pinch of salt.If you like, add a squeeze of lemon and a sprinkle of chopped parsley.
9. Slice and serve. Slice the steak against the grain into thin strips. Spoon chimichurri over the top and serve with the crispy fingerlings. Pass extra sauce at the table.

Storage Instructions

• Steak: Store sliced steak in an airtight container for up to 3 days.Reheat gently in a skillet over low heat or enjoy cold in salads or wraps.
• Potatoes: Keep in an airtight container up to 3 days. Re-crisp in a 425°F oven or air fryer for 5–8 minutes.
• Chimichurri: Keeps 3–4 days in the fridge. Cover with a thin layer of olive oil to prevent browning.It also freezes well in small portions.

Benefits of This Recipe

• Speedy and satisfying: A full meal with bold flavor in about 25 minutes.
• Balanced flavors: Rich steak, crisp potatoes, and a fresh, tangy sauce that cuts through the richness.
• Minimal equipment: One sheet pan and one skillet.
• Versatile sauce: Chimichurri perks up grilled chicken, seafood, veggies, and grain bowls.
• Great for meal prep: Leftovers turn into excellent salads, tacos, or sandwiches.

Common Mistakes to Avoid

• Not drying the steak: Moisture blocks browning. Pat it dry for a good sear.
• Overcooking: Flank steak gets tough if cooked past medium. Use a thermometer for accuracy.
• Skipping the rest: Slicing too soon makes the juices run out.Resting keeps it tender.
• Using a cold pan: You need a very hot skillet for a proper crust.
• Blitzing chimichurri too smooth: Over-processing can make it bitter. Hand-chop or pulse lightly for texture.

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Recipe Variations

• Citrus twist: Add lemon zest and a squeeze of lime to the chimichurri for extra brightness.
• Shallot kick: Stir in 1 finely minced shallot for sweet, mild bite.
• No-cilantro version: Use all parsley and extra oregano. It’s classic and clean.
• Spicy version: Add a chopped fresh chili (Fresno or jalapeño) to the sauce.
• Grilled option: Cook the steak on a hot grill, 3–4 minutes per side, and toss the potatoes in a grill basket.
• Veg-forward swap: Replace potatoes with roasted cauliflower, broccolini, or a mix of peppers and onions.
• Other cuts: Skirt, hanger, or flat iron work well; just adjust timing due to thickness.

FAQ

Can I make the chimichurri ahead of time?

Yes.

It actually tastes better after 30–60 minutes as the flavors meld. Store it in the fridge up to 3–4 days and bring to room temperature before serving.

What if I don’t have fingerling potatoes?

Use small Yukon Golds or baby reds and cut them into 1/2-inch wedges. Keep the cut sides down for crisp edges.

How do I know which way to slice the flank steak?

Look for the long lines of muscle fibers running across the meat.

Slice perpendicular to those lines, at a slight angle, into thin strips. This shortens the fibers and keeps each bite tender.

Can I marinate the steak?

Absolutely. A quick 30-minute marinade with olive oil, a splash of vinegar or lime, garlic, and spices works well.

Pat dry before searing to ensure good browning.

Is there a way to keep the potatoes extra crispy?

Yes. Don’t overcrowd the pan, preheat the oven fully, and roast cut-side down. If needed, switch to convection for the last 5 minutes to dry and crisp the edges.

What temperature should I cook the steak to?

For medium-rare, aim for 125–130°F before resting.

It will rise a few degrees off heat. For medium, 135°F. Beyond that, flank can become tough.

Can I make this dairy-free and gluten-free?

It already is.

All ingredients are naturally gluten- and dairy-free as written.

What can I serve with it besides potatoes?

Try a simple tomato-cucumber salad, grilled asparagus, buttered corn, or a quinoa pilaf. The chimichurri also loves a bed of arugula.

Can I use dried herbs in chimichurri?

Fresh herbs are best, but you can use 1 teaspoon dried oregano. Avoid dried parsley or cilantro—they won’t deliver the right flavor or texture.

How do I scale this for a crowd?

Cook steak in batches so you don’t crowd the pan.

Keep finished steaks tented while you sear the rest. Use two sheet pans for the potatoes and rotate them halfway through roasting.

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Wrapping Up

A bright chimichurri and a quick-seared flank steak are a weeknight power duo, and those crispy fingerlings round out the plate without extra fuss. The flavors are bold, the steps are simple, and everything hits the table fast.

Keep this recipe in your back pocket for busy nights or casual dinners with friends. It’s unfussy, reliable, and tastes like you put in way more effort than you did.