While the potatoes are baking, place a medium pot over-medium low heat.
Add in the oil and 2 tablespoon butter.
When the butter is melted, add in the onions and stir.
After 4 minutes, sprinkle with sugar and stir to combine.
Allow to cook down for 30-40 minutes or until the onions are very soft and have begun to caramelize.
When the potatoes are done, remove from the oven and place on a baking sheet allowing to cool for 5 minutes.
Place the oven rack to the broiler position and put the broiler on high.
Run a knife lengthwise across the salted top, leaving about 1/2 inch on both sides.
Using both hands, pinch each side of the potato.
While pinching, push towards the center of the potato, forcing it to open up.
Keep pushing and squeeze the fluffy insides up.
Take a spoon and remove just a few tablespoon of the fleshy insides. You can save this for another use or just quickly put some butter and sour cream on it and inhale like I do. LOL
Evenly divide the salt and pepper and sprinkle the inside of the potato.
Place a tablespoon of butter inside.
Next, take the roast beef and Worcestershire and add it into the pot with the onions.
Gently stir just to combine.
Divide the onion beef mixture and stuff it into the potatoes, mounding slightly.
Divide the cheese and place heaping mounds on top.
Place the baking sheet back in the oven under the broiler just until the cheese is melted. ~1-2 minutes.