Preheat the oven to 400 degrees. Add a layer of lentils to the bottom of each taco shell and place in a casserole dish. Add about 1 tablespoon of vegan queso to each taco. Place in the oven (uncovered) and bake for 7-10 minutes - or until the the shells are slightly browned and the queso is bubbling.
While the tacos are cooking, prepare the toppings. Combine the yellow onion, cilantro, lime juice & a pinch of salt in a bowl and stir to combine.
Remove the tacos from the oven and top with lettuce, onions and hot sauce. Serve with additional lime wedges.
Video
Notes
I used a 12"x8" casserole dish. Depending on the shells you use, it might be tricky to keep the taco shells standing straight up. I found the best way to load them up was by adding the lentils to each shell one at a time and then carefully leaning them against one another. If they fall over while cooking, don't worry, they will still taste good.
This will make more queso and more lentils than you will need for 8 tacos. Save the leftovers to make taco bowls the next day. Or eat the leftover queso with chips.