01 -
Put the steak chunks in a big mixing bowl. Sprinkle on the salt, black pepper, and red pepper flakes (if using), and toss well. Let them sit out for 30 minutes so they come to room temperature.
02 -
Pour avocado oil over the steak and mix everything to coat the pieces evenly in the oil.
03 -
Warm up a cast-iron skillet on medium-high heat. When it’s hot, add half the steak chunks in one layer. Cook for about 2 to 3 minutes per side, then move them to a wire rack placed on a baking sheet and cover lightly with foil. Repeat with the second batch.
04 -
Turn the heat down low on the skillet. Drop in the butter and once it’s melted, add the minced garlic. Cook for about 30 seconds or until you smell the garlic aroma, then take it off the heat.
05 -
Toss the cooked steak chunks back into the pan with the garlicky butter for an even coating.
06 -
Serve right away. Sprinkle parsley on top if you’d like.