Heat olive oil over medium-low heat in skillet. Once oil is hot, add onions and toss with spoon to coat. Allow onions to cook 2-3 minutes and add 1/2 tsp salt and 1/4 tsp pepper.
Continue to cook over medium-low heat until the onions start to soften. This about 3-5 additional minutes. Add frozen peas and sauté another 10-12 minutes, now over low heat until the peas are tender-crisp. Give a quick taste at this point.
You may want to add another dash or two of salt and a pepper. The additional salt will bring out the natural sweet flavor of the pea and the pepper will add a fun little kick to the onion. I always add this additional pinch of seasoning, but I know that taste is highly personal and some may not like it, so I encourage tasting before adding. Serve warm.
This quick and simple vegetable is a staple in my house. It is fast, healthy, tasty, and so easily fits into my frugal ways. Give it a try! I think you will be surprised.