Place a large skillet over medium-high heat and add the ground meat, browning until fully cooked and no pink remains.
Drain any excess fat or liquid from the skillet.
Stir in the marinara sauce, dried oregano, and garlic powder, then season with salt and pepper.
Reduce heat to medium-low and simmer for 3 to 5 minutes to allow flavors to meld.
Incorporate the diced green peppers and black olives into the mixture and heat for 2 minutes.
Divide the meat mixture evenly into two heat-safe serving bowls.
Top each bowl with a layer of shredded mozzarella cheese and sliced pepperoni.
Place under a broiler for 1-2 minutes or microwave for 60 seconds until the cheese is melted and bubbling.