Preheat your oven to 425 degrees F.

Lay your Flank Steak flat on your sheet pan.

In a small bowl, gently mix your oil and seasoning spices until combined.

Add your sliced peppers and onions to a bowl and toss them with two Tbsp of the spice/oil mixture until fully coated.

Drizzle half of the remaining oil mixture over the Flank Steak. Then, drizzle half of the lime juice over the Flank Steak.

Rub this mixture into the face-up side of the Flank Steak. Flip the meat and pour the remaining oil mixture and lime juice on to the other side of the steak. Rub the mixture in until the beef is fully covered.

Carefully arrange your seasoned peppers and onions around the beef on the sheet pan.

Place the pan in the oven, and bake for ~15 minutes or until the internal temperature of the meat has reached 145°F for medium rare as measured by a meat thermometer

Remove the pan from the oven and let it rest for 15 minutes.

After 15 minutes, remove the steak from the pan and transfer it to a cutting board, and slice the meat against the grain into your desired size strips or pieces.