Potato Spinach frittata

This was inspired by my mother-in-law. We were at her birthday party the other day and she served - among other yummy things -a frittata with spinach. It was delicious, and the kids couldn't get enough of it. Today I decide to make a meal out of it and added some potatoes.Here is how I made mine:(For 4 people)2 medium onions (yellow, red...whatever you like),