Heat oil in large skillet over medium-high heat. Cook onion, garlic and salt until onion begins to soften, 3 to 4 minutes. Add lentils and taco seasoning. Cook until spices are fragrant and lentils are dry, about 1 minute. Add broth; bring to a boil. Reduce heat, cover and simmer until lentils are tender, 25 to 30 minutes. Mix sour cream, chile and adobo sauce in a bowl. Uncover lentils and cook until mixture thickens, 6 to 8 minutes. Mash with a rubber spatula. Spoon 1/4 cup lentil mixture into each taco shell. Top with 2 heaping teaspoons sour cream mixture, lettuce, tomato and cheese.
Per serving (2 tacos): 249 calories, 7.1 g fat (1.9 g saturated), 37.1 g carbohydrates, 9.7 g fiber, 11.5 g protein Nutritional analysis provided by Self