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Lay a large tortilla flat on a clean surface.
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In the center, spread a small spoonful of sour cream and salsa.
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Layer the cooked hash browns, scrambled eggs, bacon slice, and a sprinkle of shredded cheese.
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Place a tostada shell (or a handful of crunchy tortilla chips) on top.
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If using avocado or guacamole, add it as the final layer.