Combine avocados, tomatoes, black beans, corn, cilantro, red onion, oil, vinegar, salt, and black pepper in a bowl until salsa is well mixed.
Spoon salsa into each tortilla and top with Monterey Jack cheese. Roll tortilla around filling to create a burrito.
Warm burritos on a microwave-safe plate in the microwave until cheese is melted and salsa is warmed, about 45 seconds. Top burritos with sour cream.
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