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Heat olive oil in a large pan.
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Add onions and cook on medium heat until translucent, roughly 8-10 minutes.
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Add mushrooms and cook until mushrooms are cooked through, roughly 5 minutes.
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Add garlic, taco seasoning, peppers, salt and pepper and cook until peppers just start to wilt, 5 minutes.
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Veggie mixture can be prepped ahead of time and stored in fridge. I like to do this, makes prep a pinch!
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When you're ready, add beef to sautéed veggie mixture and cook, folding and mixing constantly until beef is cooked and no longer pink in color. Transfer beef and veggie mixture to a bowl and let cool.
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Meanwhile, prep your veggies: Shred romaine, slice corn off the cobb, slice avocado and chop red onion.