Crumble ground beef into a large skillet. Saute over medium heat until brown and drain, then add onion, garlic and green pepper. Continue to saute until onion is clear. Mix in 1/2 c tomato sauce, bread crumbs, and seasoning salt. Spoon mixture into pastry shell.
In a medium bowl, mix together cheese, milk, worcestershire sauce, and black pepper. Spread mixture over meat filling.
Bake in preheated oven for 15-20 minutes, until topping is puffy and lightly browned. Allow to set for 10-15 minutes before serving.