Sift the ancho, cumin, paprika, garlic powder, onion powder, coriander, black pepper, and cayenne through a fine-mesh sieve into a wide bowl. Discard any hard or discolored pieces.
Scatter the crushed oregano and salt over the sifted powders. Whisk for 45 seconds, scraping the edges twice, until no pale or dark streaks remain.
Transfer the blend into a clean, completely dry glass jar. Seal it and label with the date, ingredients, and usage ratio (2 tablespoons per 450 g filling).
To use: Brown or warm the filling first, then stir in 2 tablespoons of the blend over medium heat for 30 seconds. Add liquid sooner if the pan dries or the garlic smells sharp.
Add ⅓ cup water or stock and simmer for 3–5 minutes. Taste and adjust salt, cayenne, or lime before serving.