Heat the 1 tablespoon vegetable oil in a medium saucepan over medium heat.
Stir in the chopped ½ cup white onion, 2 chipotle peppers in adobo sauce and minced 1 garlic clove. Cook until soft and fragrant, about 5 minutes.
Stir in the 1 ½ cups plain tomato sauce, ½ cup low-sodium chicken broth, ½ teaspoon coarse Kosher salt, ½ teaspoon paprika, 1 teaspoon dried oregano, ½ teaspoon chili powder and 2 tablespoons fresh lime juice, stirring to combine. Simmer on low for 5 minutes.
Using an immersion blender, or transferring the whole mixture to a stand blender or food processor, blend until smooth.
Set aside until ready to use.
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Video
Notes
To adjust heat, use more or less chipotle peppers in adobo sauce. They are pretty spicy and also smoky.