Using skillet cook the chicken until done. Once chicken is done cut the chicken into cubes.
Cut the cherry tomatoes in half
Carefully cut the avocado into slices.
To make dressing combine white wine vinegar  olive oil dijon. Whisk together.
Put walnuts into food processor and coarsely chop. Or buy pre-chopped walnuts.
In a large bowl combine  spinach  cherry tomatoes  corn  chicken  avocados  feta cheese  walnuts. Toss salad together to mix ingredients.
Pour dressing over top.