01 - Preheat oven to 400°F. Prick each russet potato several times with a fork, rub with a small amount of olive oil and a light sprinkle of salt. Place directly on the oven rack and bake for 60 to 70 minutes, until skins are crisp and centers are tender.
02 - Meanwhile, heat olive oil in a large skillet over medium heat. Add diced onion and cook until soft, about 2 to 3 minutes. Stir in minced garlic and cook for 30 seconds more.
03 - Add ground beef to the skillet. Break up with a spoon and cook until browned and fully cooked through. If excess fat remains, drain before proceeding.
04 - Sprinkle taco seasoning over the browned meat, pour in water, and stir to combine. Simmer for 3 to 4 minutes until thick. Adjust with salt and pepper to taste.
05 - Remove baked potatoes from oven and allow to cool slightly. Cut each open lengthwise and gently fluff the insides with a fork.
06 - Fill each potato generously with taco meat. Top with shredded cheese, diced tomatoes, sour cream, sliced olives, avocado, green onions, cilantro, and salsa or hot sauce as desired.
07 - Serve immediately, inviting diners to customize with additional toppings as preferred.