Swiss Chard and Sweet Potato Frittata

I just made this, and it tasted great! 

1 T. vegetable oil
1/2 onion
5 big stalks of swiss chard
1 clove of garlic
1/2- 1 cup chopped cooked sweet potaotes (I diced and boiled them)
1 tomato
2 eggs (or more depending on how big you want your frittata)
1 T. flour
1 T. milk
2 T. cheese (feta, gouda or monteray jack would be good, I used mozarella because that's all I had. :)
pinch of nutmeg

In oven- proof skillet or dutch oven, cook onions and vegetable oil long and low until they turn light brown, or almost carmelized.
Add swiss chard and stir until wilted.  Add garlic, and saute for 1 minute.   Add tomatoes, &
sweet potatoes.  Mix egg, flour and milk and pour over the top.  Sprinkle cheese over top.  Sprinkle with nutmeg.  Cook on stove a few minutes, then place under the broiler to finish the top.  I ate mine with a drizze of sweet chili sauce.  It was awesome!