Creating your Mediterranean Steak Bowl is simple if you follow these easy steps:

1. Prepare the Marinade: In a bowl, whisk together olive oil, red wine vinegar, oregano, garlic powder, onion powder, paprika, salt, and pepper.
2. Marinate the Steak: Place the flank steak in a resealable bag or shallow dish. Pour the marinade over the steak, ensuring it is well coated. Seal the bag or cover the dish and refrigerate for at least 15 minutes, or up to 30 minutes for more flavor.
3. Cook the Quinoa: While the steak is marinating, prepare the quinoa according to the package instructions. Set aside once cooked.
4. Cook the Steak: Heat a grill or skillet over medium-high heat. Remove the steak from the marinade and discard the excess marinade. Cook the steak for about 3-4 minutes on each side for medium-rare, or until desired doneness is reached.
5. Let the Steak Rest: Once cooked, transfer the steak to a cutting board and let it rest for about 5 minutes before slicing.
6. Chop the Vegetables: While the steak rests, chop the cherry tomatoes, cucumber, bell pepper, and red onion.
7. Slice the Steak: After resting, slice the steak against the grain into thin strips.
8. Assemble the Bowl: In a large bowl or individual serving bowls, start with a base of quinoa. Top with sliced steak, cherry tomatoes, cucumber, bell pepper, red onion, feta cheese, and olives if using.
9. Garnish: Sprinkle fresh parsley over the top for added flavor and color.
10. Serve with Tzatziki: Drizzle tzatziki sauce over the bowl or serve on the side for dipping.

These straightforward steps will guide you in creating a delicious Mediterranean Steak Bowl that everyone will enjoy.