Cook the pasta in a large pot of salted water until al dente, about 8-10 minutes. Drain and set aside, reserving a cup of pasta water.

Season steak pieces with salt, pepper, and smoked paprika. Let rest while preheating the skillet.

In a large skillet over medium-high heat, melt 1 tablespoon of butter. Sear steak pieces for 3-4 minutes, flip, and cook for another 2-3 minutes. Remove and keep warm.

Lower heat to medium, add remaining butter, then freshly minced garlic. Sauté until fragrant, about 1-2 minutes.

Add cooked pasta to skillet, tossing to coat in garlic butter. Fold in seared steak, parsley, chives, and optional red pepper flakes.

Taste and adjust seasoning with salt and pepper. If dry, add reserved pasta water for creaminess.

Serve garnished with grated Parmesan cheese.