Heat the oil in a medium skillet over medium heat until shimmering. Add the onion and cook, stirring occasionally, until soft, about 5 minutes. Add the garlic, cumin, oregano, bay leaf, and the 1 teaspoon of salt, and stir to combine. Stir in the tomato puree, chipotle peppers, and adobo sauce and bring to a boil. Reduce the heat to low and simmer for 5 minutes.