Preheat your oven to 400°F (200°C). Wash and dry the potatoes, then pierce them with a fork several times.
Bake the potatoes directly on the oven rack for 1 hour, or until tender.
Cut a slit down the middle of each potato and gently scoop out the insides, leaving a thin shell.
In a mixing bowl, combine the potato insides with sour cream, ranch dressing, 1 cup of cheese, diced jalapeños, garlic powder, onion powder, salt, and pepper. Mix until smooth.
Spoon the mixture back into the potato shells. Top with the remaining cheddar cheese.
Place the stuffed potatoes on a baking sheet and return to the oven. Bake for 15 minutes, or until the cheese is melted and bubbly.
Garnish with green onions and serve hot.