Prep: Wash and chop all salad vegetables. Place them in a large mixing bowl.
Whisk Dressing: In a small jar, combine olive oil, vinegar, salt, and pepper. Shake well.
Dry the Cheese: Pat the halloumi slices dry with a paper towel.
Fry: Heat a non-stick skillet over medium-high heat with a tiny drizzle of oil. Fry halloumi for 2–3 minutes per side until golden brown.
Assemble: Toss the vegetables with half the dressing. Divide into bowls.
Top: Place the warm halloumi slices over the greens. Sprinkle with feta and dried oregano.
Finish: Drizzle with remaining dressing and serve immediately.