Swiss Chard Frittata

Ingredients (7)

• 4 large eggs
• 4 large egg whites
• 1/4 cup grated Swiss Cheese
• 1/2 bunch 6 1/2 cups Swish Chard, washed well
• 1 large white onion 2 cups, sliced thin
• 2 tsp light butter
• salt and fresh pepper to taste