Mix together all the taco seasoning ingredients in a small bowl.
Heat a large skillet over medium-high heat. Once heated, add the tomato paste and broth and swirl in the pan until paste turns sauce-like. Add the taco seasoning and stir to combine. Add the lentils mix well together. Remove the lentil taco meat and set aside in a bowl or plate.
Immediately add the olive oil and then add the onions and bell peppers and cook until mostly soft, about 7 minutes. Add the lentils back to the pan with the tomatoes and corn. Toss together well to combine, top with cheese and cover and let cook for 5 minutes or until cheese melts.
Uncover the skillet and garnish with the avocado slices and cilantro. Serve immediately.