01 - Preheat the oven to 400°F. Prick russet potatoes with a fork, coat with olive oil and a sprinkle of salt, and set directly on the oven rack. Bake for 60 to 70 minutes, until skins are crisp and the flesh is tender.
02 - While the potatoes are baking, heat olive oil in a skillet over medium heat. Add diced onion and sauté until softened, about 2 to 3 minutes. Stir in minced garlic and cook for an additional 30 seconds.
03 - Add ground beef to the skillet and cook, breaking it up with a spoon, until evenly browned and fully cooked through. If necessary, drain excess fat.
04 - Sprinkle taco seasoning over the cooked meat, pour in water, and mix thoroughly. Simmer for 3 to 4 minutes until the mixture thickens. Adjust seasoning with salt and pepper as desired.
05 - Once baked, allow potatoes to cool slightly. Create a lengthwise slit on each and gently fluff the insides with a fork.
06 - Generously fill each potato with taco meat. Top with shredded cheese, diced tomatoes, sour cream, sliced black olives, diced avocado, green onions, chopped cilantro, and finish with salsa or hot sauce to taste.
07 - Serve immediately, offering additional toppings for personalization.