Pat the steak dry with paper towels. Cut into uniform bite-sized cubes and season generously with salt and black pepper.

In a large skillet, heat olive oil over medium-high heat until it shimmers.

Place the steak bites in a single layer in the skillet. Sear for about 2 minutes on one side, then flip and cook for another 2 minutes. Remove from skillet.

Lower the heat and add butter to the skillet. Once melted, add minced garlic and red pepper flakes. Stir until garlic is fragrant.

Return the steak bites to the skillet and toss gently in the garlic butter for about 1 minute.

Remove from heat, sprinkle with parsley, and serve hot.