Cook the Shell Pasta: Bring a large pot of salted water to a boil, add shell pasta and cook until al dente, about 8-10 minutes. Reserve ½ cup pasta water, drain pasta and set aside.

Prepare the Steak Bites: Pat steak bites dry, season with salt and pepper, and set aside.

Sear the Steak Bites: Heat a skillet over medium-high heat, add olive oil, and sear steak bites for 2-3 minutes per side. Transfer to a plate and cover with foil.

Sauté the Garlic: In the same skillet, reduce heat, add butter, and sauté minced garlic for about 1 minute until fragrant.

Make the Alfredo Sauce: Pour in heavy cream, stir constantly, and bring to a gentle simmer. Whisk in Parmesan cheese until smooth.

Combine Pasta and Sauce: Add cooked shell pasta to the sauce, toss gently, adding reserved pasta water as needed.

Plate and Serve: Serve creamy shell pasta topped with seared steak bites, drizzled with pan juices.