Sheet Pan Flank Steak and Chimichurri Recipe 

Why You’ll Love This Flank Steak and Chimichurri Recipe

I love an easy steak-based recipe like my sirloin steak tips with horseradish cream cheese, or this philly cheesecake casserole recipe. Similar to those, this flank steak recipe is a great way to enjoy a protein-packed, veggie-loaded meal without spending hours in the kitchen. The fresh ingredients really shine with every bite, and the bold, herby chimichurri adds a zesty punch.

Plus, it’s completely customizable – swap the steak for chicken, use whatever veggies you have on hand, and adjust the heat level in the chimichurri to your liking. And since it all comes together on one sheet pan, cleanup is so easy! This meal is perfect for both a special occasion or a simple weeknight dinner. Try it with a drizzle of my homemade ranch and holy moly it’s even more delicious!

Ingredient Notes

Here are a few notes on the key ingredients for this flank steak and chimichurri! Check out the full recipe and exact measurements in the recipe card below.

Steak and Veggie Sheet Pan

• Flank steak: Lean, flavorful, and perfect when sliced into thin strips. Everybody likes different cuts of meat so choose your favorite! Swap with grilled skirt steak or sirloin if needed.
• Zucchini: Adds a light, slightly sweet bite that roasts beautifully. Swap with bell peppers or asparagus for variety.
• Yellow squash: Brings a buttery, mild flavor that pairs well with the steak. If you don’t have it, more zucchini works just fine.
• Baby bella mushrooms: These add a deep, earthy flavor that soaks up all the juices. White button or portobello mushrooms work too.
• Sweet onion: Caramelizes as it roasts, adding a natural sweetness. Red or white onions are great substitutes.
• Homemade ranch (optional): A creamy drizzle that takes everything up a notch. Use store-bought ranch or a dairy-free version if needed.
• Fresh parsley and cilantro: These fresh herbs are for garnish. They brighten up the dish with refreshing goodness. Fresh oregano can be added or swapped here.

Chimichurri Sauce Recipe

• Red wine vinegar: Gives the sauce a tangy kick that also helps balance the richness. Apple cider vinegar or white vinegar also work.
• Fresh lemon juice: Adds a fresh, zesty flavor. Lime juice is a great alternative.
• Fresh garlic: The bold, punchy backbone of chimichurri. If you like a more mellow garlic flavor, you can use roasted garlic instead.
• Shallot: Gives a mild oniony sharpness. You can substitute a little bit of red onion here if needed/desired.
• Fresh basil: Adds a fresh flavor to the sauce. Can be swapped with more cilantro for a different twist. 
• Red pepper flakes: Brings just the right amount of heat. Adjust to taste or skip if you don’t like spice.

How to Make Flank Steak and Chimichurri

Step 1: Preheat your oven to 400 F (200 C). Prepare the chimichurri sauce. In a food processor or blender, combine chimichurri ingredients: red wine vinegar, fresh lemon juice, garlic cloves, shallot, basil, parsley, olive oil, salt, and black pepper. Blend until smooth and well combined. Taste and adjust seasoning if needed. Set aside.

Step 2: Prepare the sheet pan. On a large sheet pan, arrange the zucchini, yellow squash, and mushrooms in a single layer. Drizzle with a little olive oil (if needed) and season with salt and pepper. Toss to coat evenly.

Step 3: Cook the veggies. Place the sheet pan in the preheated oven and roast for about 15 minutes, or until the vegetables start to soften and brown slightly.

Step 4: Prepare the flank steak. While the veggies cook, season the 16 oz of flank steak with a pinch of salt, pepper, and a little homemade chimichurri sauce. Toss to coat evenly.

Step 5: Add the flank steak to the sheet pan. After the vegetables have cooked for 15 minutes, remove the sheet pan from the oven. Add the sliced flank steak to the pan, spreading it evenly over the vegetables. Return the sheet pan to the oven and cook for an additional 10-12 minutes, or until the steak is cooked through and reaches your desired level of doneness.

Step 6: Serve: When everything is cooked, remove the sheet pan from the oven and drizzle with the prepared chimichurri sauce. Optionally, drizzle with homemade ranch for extra flavor.

Serving Tips

• For additional flavor, drizzle with any of your favorite sauces like ranch dressing, soy sauce, or jalapeno bacon aioli.
• Pair with crusty bread to soak up that amazing chimichurri sauce.
• Serve with a fresh green bean salad for a fresh and light side dish.
• Top with parmesan cheese for a rich, cheesy finish.
• Use leftover flank steak for tacos, wraps, or a quick steak salad!