Preheat your oven to 400°F and line a baking sheet with parchment paper.
Wash and dice the Russet potato into half-inch cubes, then toss them in a bowl with olive oil, garlic powder, and a pinch of sea salt.
Spread the potatoes evenly on the baking sheet and roast for 25 minutes, flipping halfway through, until they are golden and crispy.
While the potatoes roast, heat a non-stick skillet over medium-high heat and add the ground beef.
Season the beef with the remaining sea salt and black pepper, breaking it up with a spatula as it cooks until fully browned and cooked through.
Prepare the base of the bowl by chopping the romaine lettuce and placing it in a large serving dish.
Halve the cherry tomatoes, thinly slice the red onion, and chop the dill pickles.
Assemble the bowl by topping the lettuce with the cooked beef, roasted potatoes, tomatoes, onion, and pickles.
Finish the dish by drizzling the yellow mustard over the top before serving.