Stir Fried Bell Peppers with Mushrooms and Onions

We're eating lower-carb this week, so I'm preparing a lot of vegetables with our meals. I love stir fried peppers, and adding mushrooms and onions ups the flavour component beautifully.

1/2 green pepper, seeded and sliced
1/2 yellow pepper, seeded and sliced
1 c. sliced white mushrooms
1 small yellow onion, thinly sliced
1 clove minced garlic
1/2 bunch green onions, chopped 
1/2 tbsp olive oil
sea salt and black pepper, to taste

Add olive oil and heat in a large frying pan. I have a favorite skillet that's deep and non-stick. When the oil is hot, add the yellow onions. Cook, stirring ocassionally, until they are softening. Add the mushrooms, and do the same. Add the peppers and garlic. Stir until peppers are tender-crisp and brightly coloured, then immediately remove from heat.
Garnish with green onions.

Pictured with Parmesan Crusted Tilapia.
Edited on 9/20/14:  
I made this for dinner tonight, but just used a red pepper, and omitted the green onions. The only thing I did a little differently for seasoning was add the garlic in with the onions and use a whole package of fresh mushrooms.The flavours were much more bright.. Here's a picture of it cooking:

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