Step 1: Season the steak pieces generously with salt and pepper in a medium bowl, ensuring each piece is well coated.
Step 2: Heat the olive oil in a large skillet or cast-iron pan over medium-high heat until it shimmers. This hot pan is crucial for a good sear.
Step 3: Add the seasoned steak bites to the hot skillet in a single layer. Do not overcrowd the pan; cook in batches if necessary to ensure a proper sear. Cook for 2-3 minutes on each side until they reach your desired doneness (medium-rare to medium is recommended for optimal tenderness).
Step 4: Once the steak is cooked, push it to one side of the skillet. Add the unsalted butter and minced garlic to the empty side of the pan. Sauté for about 30 seconds until the garlic is fragrant and the butter is melted and slightly browned.
Step 5: Toss the cooked steak bites in the garlic butter mixture until they are thoroughly coated. This infuses them with incredible flavor.
Step 6: Reduce the heat to medium-low. Pour the heavy cream into the skillet, stirring to combine it with the garlic butter. Let it come to a gentle simmer.
Step 7: Gradually add the grated Parmesan cheese, stirring continuously until the cheese is fully melted and the sauce is smooth and creamy. Stir in the Italian seasoning, and taste, adjusting with additional salt and pepper as needed.
Step 8: Gently toss the garlic butter steak bites in the Parmesan cream sauce until every piece is beautifully coated.
Step 9: Serve immediately, garnished with fresh parsley if desired.