Cooking the Steak Bites:

1. Prepare the Steak – Pat the steak pieces dry with a paper towel. Season generously with salt, black pepper, and garlic powder.
2. Heat the Pan – In a large skillet, heat olive oil over medium-high heat until hot.
3. Sear the Steak – Add the steak bites in a single layer. Cook for about 2-3 minutes per side until browned and cooked to desired doneness. Remove the steak from the pan and set aside.
4. Make the Garlic Butter – Reduce heat to medium and add butter to the pan. Once melted, stir in minced garlic and cook until fragrant (about 30 seconds).
5. Coat the Steak – Return the steak bites to the pan and toss them in the garlic butter. Remove from heat and set aside while preparing the sauce.

Making the Parmesan Cream Sauce:

1. Prepare the Base – In the same pan, add heavy cream and bring it to a gentle simmer.
2. Incorporate Flavors – Stir in grated Parmesan cheese, Dijon mustard, and red pepper flakes (if using). Continue to stir until the sauce is smooth and thickened.
3. Balance the Flavor – Add a squeeze of lemon juice and stir.
4. Combine – Return the steak bites to the pan, tossing to coat them in the creamy sauce.
5. Garnish and Serve – Sprinkle with fresh parsley and serve immediately.