Sprinkle the cubed steak with salt and pepper to taste on all sides.
Place a large pan or a cast iron skillet over high heat. Let it heat for 2 to 3 minutes or until hot. Add the olive oil and let it heat for another minute.
Add the steak and cook for 3 to 4 minutes, occasionally stirring until browned on all sides. Remove it from the pan and set it aside.
Add the butter to the same pan and let it melt completely. Gently scrape the bottom of the pan with a wooden spoon. Reduce the heat to medium. Add the garlic and dried rosemary. Stir constantly and cook the mixture for 30 seconds or until nice and fragrant. Don't burn the garlic.
Return the cooked steak bites to the pan and baste them in the garlic butter for 1 to 2 minutes for a medium-rare steak. Please feel free to baste for an additional minute or so if you like your steak a little more cooked.
Remove the skillet from the heat. Taste the steak bites for salt and pepper and adjust.
Nutritional info is an estimate and provided as courtesy. Values may vary according to the ingredients and tools used. Please use your preferred nutritional calculator for more detailed info.