01 -
Pat steak dry with paper towel, cut into uniform 5 cm cubes. Rub with avocado oil, then evenly season all sides with Cajun seasoning, salt, and black pepper. Allow meat to rest at room temperature for 10–15 minutes.
02 -
Place peeled and quartered potatoes in cold water for 10 minutes to remove excess starch. Drain, then transfer to a large pot of salted boiling water. Cook until fork-tender, about 20 minutes.
03 -
Heat 2 tablespoons avocado oil in a large cast iron skillet over medium heat. Sear steak cubes in batches without overcrowding, turning only once. Sear for 2 minutes per side for a golden crust, adjusting time for preferred doneness. Remove steak from skillet and set aside in a covered bowl.
04 -
In the same skillet, melt 2 tablespoons salted butter over low heat. Add half the minced garlic and sauté until fragrant, about 1 minute. Return steak cubes to pan, tossing to coat in garlic butter. Remove steak and tent with foil to keep warm.
05 -
In the skillet with remaining pan juices, melt remaining 2 tablespoons butter and add rest of minced garlic. Sauté briefly. Slowly whisk in heavy cream, simmer to reduce slightly for 3–5 minutes. Stir in red pepper flakes, sliced green onions, and parmesan cheese. Continue whisking until sauce is smooth and slightly thickened; season to taste with salt and black pepper.
06 -
Drain boiled potatoes. Mash with 3 tablespoons butter, 100 ml heavy cream, and shredded cheese until smooth and creamy. Adjust seasoning with salt and freshly ground black pepper.
07 -
Spoon mashed potatoes onto serving plates. Top with garlic butter steak bites. Drizzle generously with parmesan cream sauce and sprinkle with chopped fresh parsley before serving.