Drain 1 (7-ounce) can chipotle peppers in adobo sauce, reserving the sauce. Add 1/3 cup of the sauce (reserve the remaining sauce and peppers for another use), 1/4 cup water, 2 tablespoons vegetable oil, 1 tablespoon chili powder, 2 teaspoons kosher salt, 1 teaspoon ground cumin, 1 teaspoon dried oregano, and 1/2 teaspoon black pepper to the blender. Blend until smooth. Pour into a large zip-top bag or large bowl.