Preheat oven to 400℉. Line a large rimmed baking sheet with parchment paper.
Place the cubed potatoes on your baking sheet and drizzle with olive oil and seasonings. Toss with your hands to coat all of the potatoes. Spread them out evenly on the sheet and roast for 40-45 minutes, flipping halfway through.
Ground Meat:
While the potatoes are cooking: Heat a large skillet over medium-high and add in the oil. Once its HOT, add ground meat in LARGE PIECES. The goal is to sear the meat and get and nice brown crust on each chunk of ground beef. Flip the pieces/chunks over and proceed to break up the meat with a wooden spoon. Add in the seasonings and mix. Once the meat is no longer pink add in the broth and cover with a lid. Lower the heat to a simmer and let the meat cook for 5 minutes.
Assembly:
To each bowl, first add 1/4 of the roasted potatoes, ground beef, cheese, lettuce, tomatoes, mashed avocados, pickles, toasted sesame seeds and big mac sauce.
Notes
Store leftovers in an airtight container in the fridge.