Preheat the oven to 375°F (190°C). Boil the diced potatoes in salted water until tender, about 10-15 minutes. Drain and set aside.

In a skillet over medium heat, brown the ground beef until fully cooked. Drain excess fat.

Add taco seasoning, black beans, corn, and salsa to the skillet. Stir and cook for another 5 minutes.

In a large mixing bowl, combine the cooked potatoes with the meat mixture. Stir until well combined.

Transfer the mixture to a greased baking dish. Top with shredded cheddar cheese.

Bake in the preheated oven for 20 minutes, or until the cheese is melted and bubbly.

Remove from the oven and let cool for a few minutes. Serve with sour cream and garnish with chopped green onions.