Step 1: Prepare the Steak. In a medium bowl, toss the sirloin steak strips with 2 tablespoons olive oil, 1 teaspoon salt, 1/2 teaspoon black pepper, and 1 teaspoon garlic powder. Ensure all strips are evenly coated.
Step 2: Grill the Steak. Preheat your grill to medium-high heat. Grill the steak strips for 2-3 minutes per side, or until they reach your desired doneness. Remove from grill and let rest for a few minutes before serving.
Step 3: Cook the Macaroni. While the steak is grilling, cook the elbow macaroni according to package directions until al dente. Drain and set aside.
Step 4: Make the Cajun Cheese Sauce. In a large saucepan over medium heat, combine the cooked macaroni, shredded cheddar cheese, grated Parmesan cheese, heavy cream, and Cajun seasoning. Stir continuously until the cheeses are melted and the sauce is smooth and creamy. Taste and adjust seasoning as needed.
Step 5: Prepare the Garlic Tomato Mix. In a separate small bowl, combine the halved cherry tomatoes, minced garlic, 1 tablespoon olive oil, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Toss gently to combine.
Step 6: Serve. Divide the Cajun mac and cheese among plates. Top with the grilled steak strips and a generous spoon of the garlic tomato mix. Garnish with fresh parsley and chives, if desired, and serve immediately.