Preheat oven to 425 degrees F (220 degrees C).
Combine potatoes, oil, Mexican seasoning, and garlic salt together in a bowl; stir to coat potatoes completely. Spread potatoes in a single layer on a baking sheet.
Bake in the preheated oven, stirring occasionally, until potatoes are crisp and golden brown, 25 to 30 minutes.
Transfer potatoes to a plate and top with Mexican cheese blend, black beans, diced tomatoes, black olives, green onions, and green chiles.
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