Cut steak into 1-inch cubes, ensuring uniform size for even cooking

Pat steak pieces dry with paper towels to ensure proper browning

In a bowl, combine olive oil, Cajun seasoning, smoked paprika, garlic powder, onion powder, thyme, cayenne, salt, and pepper

Add steak cubes to the marinade and toss to coat evenly

Let marinate for at least 15 minutes at room temperature or up to 2 hours in refrigerator

Heat a large cast-iron skillet or heavy-bottomed pan over high heat

Add 1 tablespoon of oil to the hot skillet

Working in batches to avoid overcrowding, add steak bites in a single layer

Sear for 2-3 minutes without moving to develop a golden-brown crust

Flip and cook for another 2-3 minutes for medium-rare, or to desired doneness

Remove steak bites from skillet and set aside on a plate

Reduce heat to medium and add butter to the same skillet

Once butter is melted, add minced garlic and sauté for 30 seconds until fragrant

Pour in beef broth to deglaze the pan, scraping up any browned bits

Add thyme, lemon juice, and half of the parsley

Simmer for 1-2 minutes until sauce slightly thickens

Season with salt and pepper to taste

Return steak bites to the skillet with the garlic butter sauce

Toss to coat evenly and heat through for 1 minute

Garnish with remaining fresh parsley

Serve immediately over rice or mashed potatoes with steamed vegetables on the side