Let the steak reach room temperature, pat it dry, and season with salt, pepper, and minced garlic.
Heat a cast iron skillet over high heat until it’s smoking hot.
Add avocado oil to the skillet and place your seasoned steak in.
Once flipped, add butter, minced garlic, and fresh herbs, spooning the mixture over the steak.
Check for medium-rare doneness at around 130°F using a meat thermometer.
Let the steak rest for at least five minutes after removing from heat.
Mix softened butter with parsley, green onions, Dijon mustard, lemon juice, zest, and spices until creamy.
Slice the steak against the grain and top with cowboy butter before serving.