Trim the steak of any excess fat or silver skin. Cut into 2" pieces. Drizzle the steak bites in 2 tbsp avocado oil, it has a higher smoke point than olive oil.
Liberally coat steak in cajun seasoning. In a cast iron skillet (or regular skillet) add 2 tablespoons of avocado oil over medium-high heat.
Cook them undisturbed about 2 minutes, or until they have a good golden coloring. Flip just once. Continue to cook 1 minute, then reduce heat to low and cook another minute.
Scoot steak to one side of the pan. Add in 2 tablespoons of butter and 1 tablespoon minced garlic, saute until fragrant. Toss the steak in the garlic butter, tossing to coat on all sides, cooking another minute.
Remove steak and place in a bowl, tented with foil to keep moist.