Yummy Sweet Potato Frittata

1 peeled- diced sweet potato
3-4 strips of leeks sliced thinly
1 cubed portabello mushroom (lightly stir -fried)to reduce its volume
2 beaten eggs
sea salt
feta cheese

mix beaten eggs with the first three ingredients and poor into a shallow pie plate
spread the lightly stir-fried mushroom on top of mixture
sprinkle sea salt on top

bake at 350 degrees for 25-30 minutes

Take out of oven and sprinkle the feta on top