Squeeze spinach to remove as much liquid as possible. I just grab it by the handful and squeeze it over the sink.
Add to yogurt mixture.
Stir in cucumbers, lemon juice, parsley, and chives.
Stir well to combine. Refrigerate at least 1 hour to thicken. It gets better the longer it sits so it's perfect to make a day ahead of time. Serve with tortilla chips and fresh veggies!