Prepare the peppers

• Cut the bell peppers in half and remove the seeds and membranes.
• Place them in a baking dish.

Cook the filling

• Heat the olive oil in a frying pan and soften the onion and garlic.
• Add the ground beef and brown it, breaking it up.
• Stir in the tomato passata and the cooked rice, then season with salt and pepper.

Fill the peppers

• Spoon the filling into the pepper halves.
• Top with the grated mozzarella.

Bake

• Bake at 190 °C until the peppers are tender and the cheese is golden.