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Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish.
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In a large skillet, heat the olive oil over medium heat. Cook the bacon until crisp. Transfer to a paper towel-lined plate, then chop into pieces.
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Spread the diced potatoes evenly in the prepared baking dish. Sprinkle the chopped green onions over the potatoes.
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In a large bowl, whisk together the beaten eggs and evaporated milk. Pour this mixture evenly over the potatoes and green onions.
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Scatter the chopped bacon over the top, followed by the shredded cheese. Season evenly with the salt and pepper.
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Bake for 45-55 minutes, or until the top is golden brown and the center is fully set.
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Remove from the oven and let the casserole rest for 10 minutes before slicing and serving.
