Roast Sirloin with Potato Bake
Roasted Beef Sirloin with Garlic Potatoes is such a comforting dish, perfect for those evenings when you crave something hearty and satisfying. The tender, juicy beef sirloin combines beautifully with flavorful garlic potatoes that bake to a golden perfection. The aroma that fills your kitchen while it’s roasting is enough to make anyone’s mouth water, making it an ideal option for family dinners or special occasions.
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This recipe is one of those classic dishes that I find myself returning to, year after year, because it balances lush flavors with effortless preparation. You don’t need to be a culinary expert to create a meal that would impress even the pickiest eaters. The simple yet elegant combination of roasted beef and seasoned potatoes guarantees a comforting dinner that rivals anything from a high-end restaurant. I can’t wait for you to try it!
Why You’ll Love This Recipe
- Simple & Quick: In just about 15 minutes of prep and 75 minutes in the oven, you’ll have a delicious meal ready to enjoy.
- Irresistible Flavor: The aromatic garlic and fresh herbs elevate the beef’s natural richness, ensuring each bite is satisfying.
- Eye-Catching Appeal: Presenting a beautifully roasted sirloin surrounded by golden garlic potatoes makes for an impressive dinner spread.
- Flexible Serving: Perfect for family dinners, holiday celebrations, or just a cozy night in when comfort food is needed.
- Diet-Friendly Options: Easily adaptable for certain dietary needs. Swap potatoes for veggies for a lower-carb dinner.

Ingredients You’ll Need
- 2 pounds beef sirloin: This cut is ideal for roasting as it becomes beautifully tender and flavorful. Look for well-marbled beef for the best results.
- 1 pound baby potatoes: These tiny gems cook quickly and their skins crisp up perfectly in the oven. You can substitute with larger potatoes, just cut them into even pieces.
- 4 cloves garlic, minced: Fresh garlic adds a robust flavor that infuses both the beef and potatoes. Feel free to use garlic powder in a pinch, adjusting the quantity to your taste.
- 2 tablespoons olive oil: This helps to develop a crispy exterior and adds richness. You can swap for avocado oil if preferred.
- 1 teaspoon salt: Essential for enhancing all other flavors in the dish. An extra pinch is great for seasoning the potatoes.
- 1/2 teaspoon black pepper: Provides warmth and just the right amount of kick. Freshly ground black pepper is always a better choice.
- 1 teaspoon dried thyme: This herb pairs beautifully with beef. If fresh thyme is available, it can add an even more vibrant flavor.
- 1 teaspoon rosemary: Rosemary rounds out the flavor profile wonderfully; fresh or dried works, though fresh offers a stronger aroma.
How to Make Roast Sirloin with Potato Bake
Preheat Your Oven: Start by preheating your oven to 400°F (200°C). Ensure it’s fully heated for an even roast.
Mix Garlic Herb Rub: In a mixing bowl, combine the minced garlic, 2 tablespoons of olive oil, 1 teaspoon of salt, 1/2 teaspoon of black pepper, 1 teaspoon of dried thyme, and 1 teaspoon of rosemary. This fragrant mixture will serve as the flavor base for your sirloin.
Rub the Sirloin: Generously apply the garlic herb mixture all over your 2 pounds of beef sirloin. Ensure it’s well-coated; this will flavor the meat throughout.
Arrange the Ingredients: Place the coated beef in a roasting pan, and surround it with 1 pound of baby potatoes. You can nestle them around the edges so everything cooks evenly.
Roast in the Oven: Place your pan in the preheated oven and roast for about 1 hour. Use a meat thermometer to check for doneness; look for a reading of 135°F (57°C) for medium-rare beef.
Rest the Meat: Once it’s cooked, remove the roasted beef from the oven and allow it to rest for 10 minutes. This crucial step helps the juices redistribute, ensuring each slice remains juicy.
Slice and Serve: Carve the beef against the grain into thin slices and serve with the beautifully roasted garlic potatoes—get ready for compliments!

Storing & Reheating
To store leftovers, allow your roast to cool to room temperature before placing it in an airtight container. It can stay at room temperature for about two hours before refrigerating, where it can last up to 3 days. If you want to freeze it, wrap it tightly in plastic wrap followed by aluminum foil, storing it for up to 3 months. When reheating, place the beef in the oven at 350°F (175°C) for about 10-15 minutes to maintain its juiciness, but be aware that the texture may be slightly different. Refresh with a splash of broth if needed.
Chef’s Helpful Tips
- Avoid overcooking the beef by using a reliable meat thermometer and removing it promptly at 135°F (57°C) for perfect medium-rare.
- Let the beef rest after roasting; this step is vital for juicy results.
- Cut the potatoes into even sizes to ensure they roast uniformly.
- If you’re short on time, season the beef a few hours in advance and let it marinate in the fridge for a flavor boost.
- Experiment with other herbs; sage or oregano can create delicious alternatives.
- Prepping your potatoes in the same pan as the beef allows them to absorb the delicious juices.
Roasted Beef Sirloin with Garlic Potatoes is not just a meal; it’s a delightful way to reconnect with wholesome flavors and create lasting memories over dinner. The simplicity of preparation alongside the rich taste will undoubtedly have your loved ones reaching for second helpings. Feel free to experiment with side dishes or toppings that excite you. Whether you add a rich gravy or a fresh chimichurri sauce, the base remains absolutely scrumptious. Enjoy the process of making this dish, and happy cooking!
Recipe FAQs
Can I use a different cut of beef for this recipe?
Absolutely! Though sirloin is wonderful, you can use ribeye or tenderloin for an even richer flavor. Adjust cooking times according to the cut’s thickness.
What should I serve with this dish?
Roasted sirloin pairs well with a side of green beans, a fresh salad, or even crusty bread to soak up the flavorful juices. Feel free to get creative!
Can leftovers be frozen?
Yes, leftovers can be frozen for up to 3 months if stored correctly in airtight packaging. Just be mindful that the texture might change slightly upon reheating, but it’s still delicious!
How do I know when the beef is done?
Using an instant-read thermometer is the most reliable method! For medium-rare, aim for a reading of 135°F (57°C). If you prefer it more done, adjust the temperature accordingly and always let it rest to keep it juicy.
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📖 Recipe Card

Roast Sirloin with Potato Bake
- Prep Time: 15 minutes
- Cook Time: 75 minutes
- Total Time: 1 hour 30 minutes
- Yield: 4 servings 1x
- Category: Main Dishes
- Method: Roasting
- Cuisine: American
Description
This Roast Sirloin with Potato Bake enchants with its juicy beef and garlic-infused potatoes. Perfect for easy dinners, this dish brings comfort and flavor to your table.
Ingredients
- 2 pounds beef sirloin
- 1 pound baby potatoes
- 4 cloves garlic, minced
- 2 tablespoons olive oil
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1 teaspoon dried thyme
- 1 teaspoon rosemary
Instructions
- Preheat your oven to 400°F (200°C).
- In a bowl, combine garlic, olive oil, salt, pepper, thyme, and rosemary.
- Rub this mixture generously over the beef sirloin.
- Place the beef in a roasting pan and arrange baby potatoes around it.
- Roast in the oven for approximately 1 hour, or until the meat thermometer registers 135°F (57°C) for medium-rare.
- Allow the beef to rest for 10 minutes before slicing.
- Serve with the roasted garlic potatoes.
Notes
For best results, let the meat come to room temperature before roasting.
Adjust cooking time depending on your desired doneness.
Pair with a side salad for a complete meal.
Nutrition
- Serving Size: 1 serving
- Calories: 450
- Sugar: 2g
- Sodium: 600mg
- Fat: 20g
- Saturated Fat: 6g
- Unsaturated Fat: 12g
- Trans Fat: 0g
- Carbohydrates: 35g
- Fiber: 4g
- Protein: 40g
- Cholesterol: 120mg
