Caramelize the onion
Slowly cook the sliced onion in a sauté pan along with 1 tablespoon of oil and a pinch of salt over medium-low heat, until softened and caramelized. Stir only occasionally.
Roast the steak fries
Roast a generous handful of steak fries according to the package directions, if store-bought. If making from scratch, roast ¼-inch-thick wedges of russet or gold potatoes in a 425°F oven until tender and golden-brown.
Heat the JUST Egg Folded
Heat the folded eggs in a toaster, skillet, oven or microwave, according to the box directions.
Assemble the sandwich
Lightly toast the brioche buns, then spread both halves with chipotle mayo. Start the sandwich with a big pinch of caramelized onions. Layer on a folded JUST Egg and a slice of cheddar cheese. Arrange steak fries on top of the cheese. Season with salt and pepper. Close the sandwich and enjoy immediately – or take it to-go.