Preheat oven to 400 degrees F. Coat 12 muffin cups with cooking spray or line with paper liners.Combine lemon zest and sugar in a large bowl. Stir in yogurt, applesauce (if using), oil, egg.To the yogurt mixture, add flour, baking powder, baking soda and salt. Fold in until almost blended. Gently fold in strawberries.Divide batter; which will be thick, among the muffin cups.Bake muffins until edges and tops are golden, 18 to 25 minutes. Let cool in the pan for five minutes before removing to wire rack. Enjoy!