Preheat the oven to 375°F (190°C).

Slice the bell peppers in half lengthwise and remove the seeds. Blanch in boiling water for 1-2 minutes.

In a skillet, cook the ground beef and chopped onion over medium heat until the beef is browned and the onions are translucent, about 6-8 minutes.

Add pizza sauce to the beef and onion mixture, season with salt and pepper, and let simmer for 3 minutes.

Stir in the cream cheese until melted and blended smoothly into the mixture.

Fold in the shredded cheddar cheese until melted.

Stuff the prepared bell pepper halves with the beef filling and place them upright in a baking dish.

Top each stuffed pepper with shredded mozzarella cheese and any optional toppings like olives or pepperoni.

Bake for 25-30 minutes until the peppers are tender and the cheese is golden brown.

Let cool before serving and enjoy with a side salad.