Preheat the oven to 350F / 175c.
Cook the orzo according to package instructions and drain.
½ cup dry orzo
Whilst the orzo is cooking, you can make the filling.
Heat a teaspoon of oil in a large skillet. Once hot, add in the ground beef, season with salt and pepper, and brown.
1 pound medium ground beef
Once brown, add in the onion and garlic and cook til soft.
½ large onion, 2 garlic cloves
Add in the rest of the ingredients for the filling and stir to combine. Take off of the heat and stir in the cooked orzo.
⅓ cup feta cheese, ¼ cup sliced black olives, 2 cups marinara sauce, 2 tablepoons tomato paste, 1 teaspoon dried oregano, salt and pepper to taste
Cut the bell peppers in half through the stem and remove the seeds.
3 bell peppers
Place the peppers on a foil lined tray or oven proof baking dish.
Spoon the filling into the halved peppers and sprinkle with the cheese.
shredded mozzarella
Bake in the preheated oven for 1 hour til the peppers are tender and the cheese is browned.