In a large pot, bring salted water to a boil. Add the pasta and cook according to package instructions until al dente. Reserve about ½ cup of pasta water, then drain the pasta.
In the same pot (or a mixing bowl), combine the heavy cream, grated Parmesan cheese, garlic powder, salt, and black pepper. Stir well until the cheese is melted and the sauce is creamy. If the sauce is too thick, add a little reserved pasta water to reach the desired consistency. Set aside.
In a skillet over medium-high heat, melt the butter and add the olive oil. Once hot, add the steak bites, seasoning them with salt and black pepper. Sear for 2-3 minutes, stirring occasionally until browned and cooked to your desired doneness.
Add the minced garlic to the skillet with the steak and cook for another minute until fragrant.
Add the cooked pasta to the skillet with the steak bites. Pour the creamy Parmesan sauce over the pasta and steak. Toss well to combine, ensuring everything is coated with the sauce.
Divide the Garlic Butter Steak Bites with Creamy Parmesan Pasta among plates. Garnish with chopped fresh parsley if desired.