Heat a non-stick skillet over medium-high heat.

Add the ground turkey to the skillet and cook until browned, breaking it into small crumbles, approximately 8-10 minutes.

Drain any excess fat from the skillet.

Stir in the diced bell peppers and red onions, cooking for an additional 3-4 minutes until slightly softened.

Add the marinara sauce, oregano, garlic powder, and red pepper flakes, stirring to combine and heating through for 2 minutes.

Transfer the mixture to a microwave-safe or oven-safe bowl.

Layer the shredded mozzarella cheese and pepperoni slices on top of the meat mixture.

Place under a broiler for 2-3 minutes or microwave for 45-60 seconds until the cheese is melted and bubbly.

Let stand for 2 minutes before serving.