In a medium bowl, season the steak with salt and pepper, smoked paprika and red pepper flakes. Toss to coat.
Preheat cast iron skillet over medium-high heat and add olive oil. Add steak pieces and cook for 1-2 minutes, without touching. Carefully flip each piece and cook for an extra 1-2 minutes. Transfer onto the plate.
To the same skillet, add butter and let it melt. Add garlic and cook for 30 seconds, stirring a few times.
Add previously cooked steak pieces and parsley. Toss steak bites with tongs until coated with the garlic butter mixture.
Serve immediately with some potato wedges on the side.
Notes
Store: Refrigerate in an airtight container for up to 4 days.
Reheat: Reheat quickly in a skillet with a bit of oil or in a microwave. Air fryer at 380 F for 2-3 minutes works great too.
Freeze:Freeze for up to 3 months in an airtight container. Thaw in the fridge overnight.