Warm gooey cheese with zippy heat is always a hit when topping a crisp salad.
Preheat oven to 350° F (180° C).
Place feta in a small baking dish.
In a small bowl, whisk together oil, honey, rosemary, and chili flakes; reserve half of the mixture. Pour over feta; cover and bake for 20 minutes or until softened and slightly puffed. Uncover and broil for 2 minutes or until light golden. Let cool slightly.
Spread salad greens onto serving platter and toss with tomatoes and cucumbers. Using spatula, place feta on top of greens. Whisk vinegar, salt, and pepper into reserved oil mixture and drizzle over salad.