Adobo is a marinade made with chile, vinegar, and spices. Marinating chicken in these rich flavors overnight is well worth the effort. This recipe pairs well with Calabacitas.
Place the onion, chicken broth, chili powder, garlic, vinegar, cumin, oregano, and salt in a blender or food processor and blend until smooth.
Pour half of the mixture into a large baking dish. Arrange the chicken breasts in the dish and pour the remaining mixture over the chicken. Cover and refrigerate overnight. Remove from the refrigerator about 30 minutes b