Frittata with swiss chard, onions, and mushrooms

Frittatas are pretty simple and easy to make on a busy week night. You  just need some eggs and fillings.
Last night I made one with

5 eggs, beat lightly
1/4 small onion, diced
4 mushrooms, chopped
4 leaves chard, chopped

Saute the onion a bit, then add the mushrooms and the chard. Pour the eggs on top and let them sit and cook over medium heat for a bit. Then put the skillet into the oven on broil. Broil till the top gets puffy and the frittata is cooked through. Keep your eye on it- it doesn't take too long.

**Not much to look at, but delicious!