Thinly slice the onion into half-moon shapes by peeling it, then slicing it once from root to tip. Lay the flat side of the onion down, then slice thinly. Place onions on the bottom of a small sheet pan that has a lip around the edge. Don’t let the oil and meat juices drip off in the oven, it could start a fire: use a rimmed baking sheet! I used a quarter sheet pan.
Next, dice the potatoes into 6 pieces each, and add to the sheet pan. Toss the onions and potatoes with the canola oil and a good pinch of salt and pepper.
Next, in a small bowl, combine the ground beef, Worcestershire, mustard powder, onion powder, garlic powder, 1/2 teaspoon salt, and 1/4 teaspoon ground pepper. Mix well with your hands, but don’t over mix. Form two oblong shaped patties with the meat. See photos for size comparison.