Get out and measure your ingredients.
Allow steak to come to room temp before cooking. (About 20 minutes)
Preheat a frying pan over medium high heat.
Combine garlic powder, coriander, minced onion, salt, pepper, red pepper flakes, and ancho chili powder in a small bowl or ramekin. Divide into 2 bowls.
Slice the onions to ¼” thick.
Roughly chop the parsley, rosemary, and garlic. Combine, then divide in half.
Brush each steak with 1 tablespoon of olive oil and season with 1 bowl of the seasoning.
Cut into 1” cubes. Add to a large mixing bowl and toss with ½ the parsley, rosemary, and garlic.
Add 1 tablespoon of olive oil to the hot pan and swirl to coat.
Cut the potatoes into quarters and add to a large mixing bowl.
Toss with remaining olive oil, onions, parsley, rosemary, garlic, and remaining half of the seasoning.
Stir until blended.
Add the bowl of potatoes and onions to the pan and top with 1 sprig of thyme and 3 tablespoon of butter, cut into slices. Cook for 10 minutes, stirring often.
Push potatoes and onions to the sides of the pan leaving an empty circle in the center. Add the steak to the center and cook for 2 minutes per side. Stir to combine.
Lower the heat to a simmer. Add the remaining butter slices, soy sauce, and thyme.
Cover and cook for 5 minutes.
Serve.
Enjoy every bite!