Heat oil on high heat in a sauté pan or dutch oven. Add onion and poblano pepper and sauté for 4-5 minutes. Add garlic and sauté for another 1 minute. Add spices and stir just long enough to toast.
Add lentils and broth to the vegetables. Bring broth to a boil, stir well and reduce heat to low. Cover and simmer for 20-30 minutes, or until lentils are tender.
Add lime juice, cilantro and salt to taste.
Preheat oven broiler.
Lay corn tortillas in a single layer on a baking sheet, and spray each side with cooking spray and sprinkle lightly with kosher salt.
Toast tortillas under the broiler until puffed and lightly golden. Flip and repeat with the other side. Watch them carefully - they go from golden to burned quickly!
To serve, top each tortilla with about ¼ cup of the lentils, and add lettuce, tomatoes, avocado, and cheese as desired.
Notes
Nutrition facts is for the lentil mixture and corn tortillas. It does not include any toppings/garnishes