Add the olive oil, lime juice, cilantro, salt, and pepper to a large mixing bowl and whisk to combine. Place the corn, tomatoes, avocado, and onion on top. Toss gently to combine.
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Notes
Storage: Store any leftovers in an airtight container. They will last about 24 hours in the fridge, specifically because of the avocados.Substitutes: For best results, follow the recipe as is. Since it's a salad though, the ingredients and measurements are just guidelines, so feel free to adjust to your taste.