Can I Use Chicken Instead of Flank Steak?

Yes, you can. Chicken thighs or breast can work. Just adjust cooking time. Chicken thighs may need closer to 20 minutes at 400°F, depending on size.

Is Chimichurri Sauce Spicy?

It doesn’t have to be. The classic recipe has a slight kick from chili flakes, but you can leave those out if you want. If you enjoy heat, add jalapeños or extra chili flakes.

What If I Don’t Like Cilantro?

Some folks have a gene that makes cilantro taste soapy. If that’s you, skip the cilantro and double the parsley. Add a bit of fresh oregano if you like.

How Do I Prevent Overcooking the Steak?

A meat thermometer is your best friend. Aim for about 135°F for medium-rare. Flank steak can turn tough if it cooks too long, so keep an eye on it.

Can I Use Apple Cider Vinegar Instead of Red Wine Vinegar?

Yes, you can. It changes the flavor a bit, but it still works well with herbs and garlic.

Flank Steak & Chimichurri Veggie Sheet Pan (Keto, Whole30, 20-Minute Meal)

Description

A quick and flavorful sheet pan dinner featuring flank steak, fresh chimichurri sauce, and roasted vegetables. This keto and Whole30-friendly meal is perfect for meal prep, easy cleanup, and busy weeknights.

Ingredients

For the Steak & Vegetables:

1.5 to 2 lbs flank steak
3 bell peppers (red, yellow, green), sliced
1 red onion, sliced into wedges
2 tbsp olive oil
1 tsp salt
½ tsp black pepper

For the Chimichurri Sauce:

1 cup fresh parsley, chopped
1 cup fresh cilantro, chopped
3 cloves garlic, minced
½ cup olive oil
3 tbsp red wine vinegar
½ tsp salt
¼ tsp black pepper
½ tsp chili flakes (optional for spice)

Instructions

Preheat oven to 400°F (200°C).
Prepare the chimichurri sauce by blending all ingredients in a food processor or mixing by hand. Adjust seasoning to taste.
Marinate the flank steak with 2 tbsp chimichurri (optional but recommended). Let it sit for 15 minutes.
Prepare vegetables: Toss bell peppers and onions with olive oil, salt, and black pepper on a sheet pan.
Place the steak in the center of the pan, surrounded by the vegetables.
Roast for 10-12 minutes, then flip the steak and cook for another 8-10 minutes (for medium-rare).
Remove from oven and let the steak rest for 5 minutes.
Slice steak against the grain and serve with extra chimichurri sauce.

Notes

Meal Prep: Marinate the steak overnight for deeper flavor.
Storage: Store leftovers in an airtight container for up to 3 days.
Reheating: Warm in a skillet over low heat or in the oven at 300°F for a few minutes.
Substitutions: Use skirt steak, chicken thighs, or salmon instead of flank steak.

Nutrition

Serving Size: 1 portion
Calories: ~450 kcal
Sugar: ~4g
Sodium: ~400mg
Fat: ~30g
Saturated Fat: ~7g
Unsaturated Fat: ~18g
Trans Fat: 0g
Carbohydrates: ~8g
Fiber: ~3g
Protein: ~40g
Cholesterol: ~90mg

Keywords: Flank steak chimichurri sheet pan, keto sheet pan steak dinner, Whole30 steak and veggies sheet pan, healthy steak meal prep recipe, easy weeknight sheet pan dinner