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Garlic butter beef bites and potatoes sizzling in a cast iron skillet with golden crispy baby potatoes, herb butter glaze, and fresh parsley

Garlic Butter Beef Bites & Potatoes

Tender sirloin cubes seared to a deep mahogany crust and tossed with crispy pan-fried potatoes in a rich garlic herb butter sauce. A fast, high-protein stovetop dinner that delivers restaurant-level flavor from a single cast iron skillet in about 30 minutes.
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Prep Time 12 minutes
Cook Time 20 minutes
Total Time 32 minutes
Servings: 4 servings
Course: Dinner
Cuisine: American
Calories: 518
Ingredients Equipment Method Notes

Ingredients
  

  • 1.5 lbs sirloin steak or beef tenderloin, cut into 1.5-inch cubes
  • 1.5 lbs baby potatoes or Yukon Gold potatoes, halved or cut into 1-inch chunks
  • 4 tbsp unsalted butter, divided
  • 2 tbsp olive oil, divided
  • 6 cloves garlic, minced
  • 1 tsp smoked paprika
  • 1 tsp onion powder
  • 1 tsp garlic powder
  • 1/2 tsp dried thyme or 4 fresh thyme sprigs
  • 1/2 tsp dried rosemary, crumbled
  • 1 tsp salt, plus more to taste
  • 1/2 tsp black pepper
  • 2 tbsp fresh parsley, finely chopped for finishing
  • 1/4 tsp red pepper flakes optional

Equipment

  • Large Cast Iron or Stainless Steel Skillet
  • Medium Saucepan for Parboiling
  • Tongs
  • Paper Towels

Method
 

  1. Parboil potato chunks in salted water 7 to 8 minutes until just fork-tender. Drain and steam dry 2 minutes.
  2. Pat beef cubes completely dry. Season with salt, pepper, smoked paprika, onion powder, and garlic powder. Rest at room temperature 10 minutes if possible.
  3. Heat 1 tbsp olive oil in a large skillet over medium-high. Sear potatoes cut side down 3 to 4 minutes without stirring until golden. Flip and cook 3 more minutes. Season and remove to a plate.
  4. Increase heat to high. Add remaining olive oil. Sear beef in a single layer, in batches if needed, 1.5 to 2 minutes per side until deeply browned. Remove and set aside.
  5. Reduce heat to medium. Add butter. Once foaming, add garlic, thyme, rosemary, and red pepper flakes. Stir constantly for 60 seconds until fragrant. Do not brown.
  6. Return beef and potatoes to the pan. Toss to coat in garlic butter for 1 minute, spooning sauce over the beef continuously. Adjust salt, finish with parsley, and serve immediately.

Notes

  • Pat beef completely dry before seasoning - surface moisture prevents searing and produces steamed, gray beef instead of a browned crust.
  • Sear in batches without crowding - a crowded pan drops the temperature and causes steaming.
  • Do not skip parboiling potatoes - raw chunks need 12 to 15 minutes in the skillet and the exterior overcooks before the interior is done.
  • Add garlic only after reducing heat to medium - garlic burns quickly in a hot pan and turns bitter.
  • Stir garlic constantly for 60 seconds maximum and move to the next step immediately.