Cut the bell peppers into thirds horizontally, remove seeds and pith. Mince the onion and microwave it for 1 minute at 600W, then let cool.

In a bowl, mix ground meat, minced onion, breadcrumbs, milk, salt, and pepper until sticky. Divide into 12 portions.

Place bell peppers and flour in a plastic bag, shake to coat. Stuff each pepper piece with the meat mixture.

Heat oil in a frying pan over medium heat. Place stuffed peppers meat-side down and cook until browned. Flip, cover, and cook on low heat for 4–5 minutes until fully cooked.