Preheat the oven to 375 degrees. Coat a baking sheet with tin foil.

Heat the oil in a large skillet over medium heat. Add the onion and cook, stirring often, for 5 minutes. Add the ground beef, making sure to break it up into crumbles with the spatula as it cooks.

Add the chili powder, cumin, paprika, garlic powder, coriander, and oregano to the beef along with sea salt and freshly cracked pepper, to taste. Cook until JUST cooked through, about 4-5 minutes. Spoon the beef onto a plate layered with a paper towel to drain any excess grease.  Set aside.

Cut the hoagies in half lengthwise then coat each of them with a thin layer of refried beans.

Spoon the beef and onion mixture evenly on top of the hoagie's halves. Top with shredded sharp cheddar, black olives, and diced tomatoes.

Place into the oven and bake for 4 minutes. Rotate the pizza tray and continue to cook for 4-5 minutes or until the pizza is crisp and the cheese is melted.

Serve with green onions, fresh cilantro, chopped avocado, and salsa. Enjoy.