Season the Steak:
Pat steak pieces dry and season with Cajun seasoning, salt, and pepper.
Sear the Steak:
Heat olive oil in a heavy skillet over medium-high heat. Add steak in batches, searing 2–3 minutes per side until browned but juicy. Remove and set aside.
Make the Bourbon Sauce:
In the same skillet, reduce heat to medium. Add butter and garlic; sauté for 1 minute until fragrant. Carefully pour in bourbon and let it reduce by half, about 2–3 minutes.
Add Flavor:
Stir in brown sugar and Worcestershire sauce. Simmer another 1–2 minutes until the sauce is slightly thickened.
Combine and Finish:
Return steak to the skillet and toss in the bourbon butter sauce until well coated. Cook 1 more minute to warm through.
Serve:
Garnish with parsley and serve hot with mashed potatoes, rice, or roasted veggies.