Heat the oil in a large skillet over medium-high heat. Add the onions, bell peppers, and garlic, and cook, stirring, until tender, about 3 minutes.
Add the ground beef and cook, breaking up the meat with the edge of a spatula until cooked through and no longer pink, 6 to 8 minutes. Drain off any excess fat and reduce the heat to medium-low.
Add the salt, pepper, chili powder, tomato paste, mustard, and coconut aminos and stir until well combined. Remove from heat, cover, and keep warm until the potatoes are ready.
When the potatoes are done, remove from the oven and let cool enough to handle. Carve a slit at the top of each potato and using a fork, fluff the inside of the potato. Top with the sloppy jane mix, serve, and enjoy!