Easy Frittata #1

I can't believe this is my first post about frittatas! Frittatas are a ridiculously easy way to throw together a meal with what you have on hand, are relatively foolproof, taste great, and are nutritious and filling.  I found a great post here about the basics of frittata making. The writer of the post gives a great summary of what ingredients work well, what order to cook them in, etc, and it's definitely worth a look.
 Today for lunch I made the frittata below. It was tasty, but I think it would have been even better with feta rather than the sharp cheddar I used:

Erin's Easy Frittata #1
olive oil
1/2 onion, chopped
2 cloves garlic, minced
1 yellow potato, chopped into small dice
1 red bell pepper, chopped
1/2 bunch of green curly kale, chopped into ribbons
1/2 tsp salt
1tsp cumin powder
1tsp chili powder
1 tsp smoked paprika
1/2 cup grated or crumbled cheese
8 eggs, whisked

Heat oven to 400F. Saute onions and garlic in a bit of olive oil in a cast iron skillet (or other pan that is stove top and oven safe). When they have softened, add potatoes, spices, and salt. Stir well and cook until potatoes are almost soft, stirring occasionally. You will probably need to add a little water periodically to help the potatoes get soft and to keep them from sticking. Once the potatoes are nearly soft, add the red peppers. Stir and continue cooking, Once the red peppers are soft, add the kale. Stir and continue cooking until kale is wilted and soft. Sprinkle the cheese on top of the vegetable saute. Pour the whisked eggs over the top, and tilt the skillet as needed to make sure everything is covered. Allow to cook on the stovetop for a few minutes. Place frittata in heated oven and cook for 8-12 minutes. Remember that a cast iron pan gets really hot, so the frittata will continue cooking a little even after you remove it from the oven. You want the top of the frittata to be set but not over-cooked.  (If you want to brown the top a little, you can turn your broiler on for the last minute or two. This always sets off my smoke alarm, so I rarely do it). When the frittata is done, remove from oven and allow to cool for about 10minutes. Cut into slices and serve with salad. This particular frittata was really good accompanied by sliced tomatoes and avocados with pepper on top.