Cut beets in half and mix in a roasting dish with 1 tablespoon extra virgin olive oil and a dash of salt and pepper. Cover with aluminum foil and roast until fork tender (approx. 45 min.). Allow to cool, peel, and cut into small dice.
Cut beet greens and swiss chard into small pieces. Saute over medium heat with scallions, 1 tablespoon extra virgin olive oil, and a dash of salt and pepper for approximately 5 minutes. Allow to cool.
Combine roasted beets with sauteed greens, sweet corn kernels and feta. Season with salt and pepper.