Preheat the oven to 180°C / 350°F.

Finely chop the onion, garlic, green bell pepper, red bell pepper, parsley, and black olives.

Cook the onion, garlic, green bell pepper, and red bell pepper in a frying pan over medium heat until softened.

Add the ground beef and cook until browned, breaking it into small pieces.

Stir in tomato paste, salt, black pepper, paprika, ground cinnamon, and parsley.

Remove the filling from the heat and let it cool slightly.

Cut the rectangular puff pastry into 6 equal squares.

Place one cheddar cheese slice in the center of each pastry square.

Divide the beef filling among the pastry squares and top each portion with shredded mozzarella and black olives.

Fold up the pastry corners to form open baskets and place them on the baking tray.

Brush the pastry with egg yolk and sprinkle with mixed seeds.

Bake for 20 minutes at 180°C / 350°F until the pastry is puffed and golden brown.