In a large bowl, combine the chopped basil, fresh blueberries, diced peaches, and sliced Persian cucumbers.
In a small bowl, whisk together the Dijon mustard, honey, fresh lemon juice, salt, and pepper.
Slowly whisk in the olive oil until the dressing is well blended.
Pour the lemon basil vinaigrette over the salad mixture in the large bowl and toss gently to coat everything evenly.
Sprinkle the crumbled feta cheese over the top of the salad.
Give the salad one more light toss to evenly distribute the feta throughout.
Serve the Blueberry Peach Feta Salad immediately for a refreshing and delicious summer dish.