Filet Steak with Caramelized Onions & Garlic Mashed Potatoes

It is date night and you want to impress. You do not need a fancy restaurant for a perfect steak. This Filet Steak with Caramelized Onions is the answer. It delivers luxury right in your own kitchen.

You will love how simple it feels to prepare. It is rich, buttery, and incredibly satisfying. This is the meal you make when you need something special. It works every single time.

Why You Will Make This Filet Steak with Caramelized Onions Again

This is the ultimate Winter comfort food. It feels high-end but uses basic pantry staples. You get tender beef and sweet, jammy onions. The garlic mash adds a perfect creamy finish.

It is a reliable meal for any special occasion. You will find yourself making it often. It is ready in just 60 minutes. That is faster than waiting for a table downtown. It is truly the best way to treat yourself.

How This Comes Together

You will start the onions first because they need time. While they brown, you boil the potatoes. The steak only takes a few minutes in the pan. It is a simple process for any beginner. You can manage everything with total ease.

What You Will Need

Gather these simple ingredients from your kitchen. Fresh thyme makes a huge difference here. High-quality butter is also key for the best flavor.

• 2 (6-8 oz) beef tenderloin filets
• 2 large yellow onions, thinly sliced
• 1 lb Yukon Gold potatoes, peeled and cubed
• 4 cloves garlic, minced
• 4 tbsp unsalted butter, divided
• 2 tbsp olive oil, divided
• 1/4 cup heavy cream
• 1 tsp fresh thyme leaves
• Kosher salt to taste
• Freshly ground black pepper to taste

Step-By-Step Directions

1. Place potatoes in a pot of cold salted water.
2. Bring to a boil and simmer for 15-20 minutes.
3. Wait until they are tender then drain them.
4. Melt 2 tbsp butter and 1 tbsp olive oil.
5. Use a large skillet over medium-low heat.
6. Add onions and a pinch of salt.
7. Cook for 30 minutes until deep golden brown.
8. Stir them occasionally so they do not burn.
9. Mash potatoes with butter, cream, and garlic.
10. Season the potatoes with salt until they are smooth.
11. Season steaks generously with salt and pepper.
12. Heat 1 tbsp olive oil in a heavy skillet.
13. Use medium-high heat for a good sear.
14. Sear steaks for 4-5 minutes per side.
15. Add remaining butter and thyme to the pan.
16. Baste the steaks during the last minute.
17. Rest steaks for 5 minutes before serving.
18. Serve alongside potatoes and topped with onions.

How To Serve It

Serve this on your best warmed plates. Pair it with a bold red wine like Malbec. Add some roasted asparagus for a pop of color. It is perfect for a cozy night in. Your guests will feel truly pampered. It is a restaurant-quality experience at home.

Leftovers and Storage

Store everything in an airtight container for three days. Reheat the steak gently in a skillet. This keeps the meat from getting tough. The potatoes reheat well in the microwave. Add a splash of milk if they seem dry. It makes a fantastic luxury lunch the next day.

Make It Even Better

• Use a cast iron skillet for the best crust.
• Do not skip the resting time for the meat.
• Let steaks sit at room temperature before cooking.
• Add a splash of balsamic to the onions.
• Use Yukon Gold potatoes for the creamiest texture.
• Keep the heat low for the onions.
• This is a Winter date night essential.
• Always use fresh garlic instead of the jarred kind.

Easy Ways To Change It Up

• Add blue cheese crumbles on top of the steak.
• Mix sautéed mushrooms with the onions for more depth.
• Use rosemary instead of thyme for a woodsy flavor.
• Try sweet potatoes for a different mash variation.

Quick Questions

Why must I rest the steak?

Resting allows the juices to redistribute. If you cut it early, the juices run out. This keeps your Filet Steak with Caramelized Onions moist.

Can I use white onions instead?

Yes, white onions work well for caramelizing. They are slightly sharper than yellow onions. Both will get sweet and delicious when cooked slowly.

Give this recipe a try for your next special night. You deserve a restaurant-quality meal without the stress. It is easier than you think.

— Ethan

Filet Steak with Caramelized Onions & Garlic Mashed Potatoes

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 40 minutes mins

Total Time 1 hour hr

Servings: 2 servings

Calories: 850

Ingredients Method

Ingredients

  

• 2 (6-8 oz) beef tenderloin filets
• 2 large yellow onions, thinly sliced
• 1 lb Yukon Gold potatoes, peeled and cubed
• 4 cloves garlic , minced
• 4 tbsp unsalted butter, divided
• 2 tbsp olive oil, divided
• 1/4 cup heavy cream
• 1 tsp fresh thyme leaves
• Kosher salt to taste
• Freshly ground black pepper to taste

Method

 

1. Place potatoes in a pot of cold salted water.
2. Bring to a boil and simmer for 15-20 minutes until tender.
3. Drain potatoes and return to the pot.
4. Mash with 1 tbsp butter, heavy cream, and minced garlic until smooth.
5. Season with salt.
6. In a large skillet over medium-low heat, melt 2 tbsp butter with 1 tbsp olive oil.
7. Add onions and a pinch of salt.
8. Cook, stirring occasionally, for 30 minutes until deep golden brown.
9. Season steaks generously with salt and pepper.
10. Heat 1 tbsp olive oil in a heavy skillet over medium-high heat.
11. Sear steaks for 4-5 minutes per side for medium-rare.
12. Add remaining 1 tbsp butter and thyme to the pan in the last minute, basting the steaks.
13. Rest steaks for 5 minutes before serving alongside potatoes and topped with onions.