Place salmon filets in a large bowl with olive oil, balsamic vinegar, oregano, salt, pepper and garlic. Let marinate until ready to cook.
Slice zucchini, cut corn off cob, and chop tomatoes. Heat a skillet over medium heat and add 1/2 tablespoon oil. Saute zucchini, corn and tomatoes with a dash of salt and pepper for 3-4 minutes until soft. Remove from pan and cover to keep hot.
Add salmon into pan and cook with all marinade for 3-4 minutes each side until salmon is done.
Place salad greens in a bowl and top with cooked veggies, salmon, remaning marinade in skillet and feta. Enjoy!