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1
Heat oil in a wide pan over medium; sauté sliced onion until softened and lightly caramelised, 6–7 minutes.
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2
Add shredded chicken, minced chipotle, adobo sauce, oregano, salt, and pepper; stir and warm through, 4–5 minutes.
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3
Fold in crema gently to combine without breaking down chicken; cook 2 more minutes until sauce coats evenly.
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4
Char or lightly warm each corn tortilla over a gas flame or dry skillet to pliability.
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5
Layer each tostada: tortilla base, spoonful of tinga chicken mixture, avocado slices, cotija cheese crumble.
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6
Finish with fresh cilantro and a small dollop of crema.
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7
Serve immediately while tinga is warm and tortillas are flexible.