Wash and scrub the russet potatoes, then pierce them several times with a fork. Brush them lightly with olive oil and sprinkle with salt.
Place the potatoes directly on the oven rack or on a baking tray. Bake for about 45–60 minutes, or until they are tender when pierced with a fork.
While the potatoes are baking, heat a skillet over medium-high heat. Add the ground beef and season with taco seasoning. Cook until browned and fully cooked, about 5–7 minutes.
Stir in the black beans and corn, cooking until heated through. Season with salt and pepper to taste, then remove from heat.
Once the potatoes are done, remove them from the oven and let cool slightly. Cut each potato down the middle lengthwise to create a pocket.
Using a fork, fluff up the insides of each potato. Fill each potato generously with the taco meat mixture.
Top each potato with a portion of shredded cheddar cheese. Return them to the oven for another 5-10 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let cool for a couple of minutes. Drizzle the top with sour cream and sprinkle diced tomatoes, green onions, and fresh cilantro.
Notes
Serve on a platter lined with lettuce leaves for added freshness, and garnish with extra cilantro and a wedge of lime for a zesty touch.