If you're using frozen peas, cook them according to the package directions, then rinse under cold water to quickly cool them.
To a small mixing bowl, add the yogurt, mayo, dill, chives, garlic, lemon juice, salt and pepper.
Whisk together until all of the ingredients are evenly incorporated into a relatively smooth dressing.
To a large salad bowl, add the cucumbers, peas, sugar snap peas, and radishes, and feta.
Top with the dressing, to taste, then toss to combine. Serve immediately and enjoy!
