Preheat your oven to 400°F (200°C). Wash the russet potatoes thoroughly, then poke holes in them with a fork to allow steam to escape. Rub each potato with olive oil and sprinkle with salt. Place them directly on the oven rack and bake for 45-60 minutes, or until tender and easily pierced with a fork.
In a medium saucepan, melt the butter over medium heat. Add the minced garlic and chopped onion, sautéing until the onions become translucent and fragrant, about 3-5 minutes.
Stir in the chicken or vegetable broth, heavy cream, dried thyme, dried rosemary, and salt and pepper. Bring the mixture to a gentle simmer and let it cook for 10 minutes, stirring occasionally. The gravy should thicken slightly.
Remove the saucepan from heat, and stir in the chopped fresh parsley for added freshness. Adjust seasoning to taste if necessary.
Once the potatoes are done baking, carefully remove them from the oven. Let them cool for a few minutes, then cut a lengthwise slit in each potato and gently fluff the insides with a fork. If using, sprinkle shredded cheddar cheese and crumbled bacon into each potato, allowing the heat to melt the cheese.
Generously ladle the herb butter gravy over each loaded potato. Garnish with chopped green onions and more fresh parsley for a vibrant finish.
Serve immediately, allowing everyone to customize their loaded potatoes with additional toppings if desired.