This easy sirloin steak dinner keeps the method straightforward: roast cubed Yukon Gold potatoes, sear the steak for color, then finish it in the oven until cooked to your liking.

A quick butter mixed with Dijon mustard and parsley melts over the warm sliced steak, while garlicky green beans add a crisp, savory side.

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Ingredients

1 tablespoon butter, softenedView ingredient guide

1 teaspoon Dijon mustardView ingredient guide

2 cloves garlic, thinly slicedView ingredient guide

6 ounces green beansView ingredient guide

1/4 ounce parsley, finely choppedView ingredient guide PPepper, to tasteView ingredient guide

Salt, to tasteView ingredient guide S12 ounces sirloin steakView ingredient guide V1 tablespoon vegetable oil, dividedView ingredient guide

12 ounces Yukon Gold potatoes, peeled and cut into 1/2-inch cubesView ingredient guide

Instructions

Preheat the oven to 425°F. Wash and dry the produce. Set the steak and 1 tablespoon butter out at room temperature while you prep.
Peel the Yukon Gold potatoes and cut them into 1/2-inch cubes. Thinly slice the garlic and finely chop the parsley.
On a baking sheet, toss the potatoes with a drizzle of vegetable oil, salt, and pepper. Roast until browned and tender, 20 to 25 minutes total; you will add the steak to the sheet before the potatoes are finished.
While the potatoes roast, heat a drizzle of vegetable oil in a large pan over medium-high heat. Season the steak with salt and pepper. Sear until browned, 2 to 3 minutes per side.
Remove the baking sheet from the oven and toss the potatoes. Place the seared steak on the same sheet, return it to the oven, and roast until cooked to your desired doneness, 5 to 7 minutes. Transfer the steak off the sheet and let it rest for 5 minutes.
Meanwhile, heat another drizzle of vegetable oil in the same large pan over medium heat. Add the green beans and cook, tossing, until tender but still slightly crisp, 4 to 5 minutes.
Add the sliced garlic to the green beans and cook until fragrant, about 30 seconds. Season with salt and pepper.
In a small bowl, stir together the softened butter, Dijon mustard, and a pinch of chopped parsley. Season the butter mixture with salt and pepper.
Slice the rested steak against the grain. Spoon the Dijon parsley butter over the steak. Serve with the roasted potatoes and garlicky green beans, garnishing with any remaining parsley.

Useful Cookware

A few helpful kitchen tools for this recipe, with relevant Amazon picks for each item.

Recipe Tips

Set the butter out early so it softens enough to mix smoothly with the Dijon and parsley.

Letting the steak sit at room temperature briefly before cooking helps it cook more evenly.

Do not add the garlic to the green beans too early; it only needs about 30 seconds to become fragrant.

Rest the steak for 5 minutes before slicing so the juices settle.

Slice the steak against the grain for a more tender bite.

FAQ

How long does this steak dinner take?

Plan on about 30 minutes from start to finish, with the potatoes roasting while the steak and green beans are cooked.

What kind of steak is used?

This recipe uses sirloin steak.

What is in the Dijon parsley butter?

It is made with softened butter, Dijon mustard, chopped parsley, salt, and pepper.

How do I keep the green beans crisp-tender?

Cook them over medium heat for 4 to 5 minutes, tossing, then add the garlic at the end for about 30 seconds.

Should I slice the steak before serving?

Yes. Let it rest for 5 minutes, then slice it against the grain and top it with the Dijon parsley butter.

Sirloin Steak with Dijon Parsley Butter, Roasted Yukon Potatoes, and Garlic Green Beans

Ingredients

Instructions

Useful Cookware

Peeler

Baking sheet

Large pan

Small bowl