Here is a quick and easy recipe for cooking tri-tip steak:

1. Heat olive oil in a large, heavy-duty skillet, preferably a cast iron skillet.
2. In a small bowl, create a seasoning mixture with the salt, black pepper, garlic powder, and rosemary.
3. Season each side of the steaks with your tri-tip rub and place the tri-tip in the hot skillet.
4. Sear each side for approximately 2 minutes.
5. Reduce heat to medium-low and continue cooking until the internal temperature reaches 135°F (57°C) for medium-rare or 145°F (63°C) for medium.
6. Remove from heat and let rest for 5-10 minutes before slicing.

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