Preheat griddle to about 400-450°F. *If cooking on the stovetop, heat a large skillet over high heat after making the garlic butter.
Make a garlic paste. Pile the minced garlic on a cutting board. Add a pinch of kosher salt and about 1 teaspoon of olive oil or avocado oil to the garlic. Hold the blunt edge of the knife with both hands, and angle the knife so that it is almost flat against the cutting board. Press and scrape the sharp end of the knife across the pile of garlic, flattening and mashing it. Scrape back into a pile, and repeat until the garlic is a paste-like consistency.
Make the garlic butter. Add softened butter, Worcestershire sauce, horseradish, and the garlic paste to a small bowl. Mix together well and set aside.
Season the steak on all sides with salt and pepper (or your favorite all-purpose steak seasoning).
When the griddle is hot, add about 1 tablespoon of high heat cooking oil to the griddle surface and spread it around with your spatula. Place the steaks on the oiled surface, pressing down slightly to ensure even contact, and sear on the first side about 1-2 minutes or until a nice crust develops. Then flip to the next side and sear. Continue to sear the steaks until rare (internal temperature about 110°F).
When steaks are seared rare, transfer to a cutting board to rest for about 5-10 minutes. Then, cut into bite-sized cubes. While steaks are resting, adjust griddle temperature down to about 375°F.
Add steak bites back to the griddle, and spoon about 2/3 of the garlic butter on top. Sauté the steak and garlic butter together on the griddle until the butter has melted in with the steak bites and the steak is cooked to your liking. Then, right before you take the steak bites off the griddle, add the remaining garlic butter and mix together briefly.
Transfer the garlic butter steak bites to a serving plate and sprinkle with some fresh chopped parsley. Serve immediately.