Preheat the oven to 425 degrees F (220 degrees C). Line a baking sheet with parchment.
Heat oil in a large skillet over medium high heat. Add ground beef and cook until browned and crumbled, about 5 minutes. Add taco seasoning and water and continue cooking on low heat until the beef has become saucy, about 5 minutes.
Place sweet peppers, cut side up, on the prepared baking sheet. Spoon meat mixture and black beans on top. Sprinkle cheese over meat and beans.
Bake in the preheated oven until the cheese is melted and bubbly, about 10 minutes.
Meanwhile, stir together yogurt, lime juice. and salt together in a bowl. Set aside.
Top nachos with salsa, yogurt sauce, fresh cilantro, avocado and jalapenos.