Hot Italian Patties

1 can (8 ounces) tomato sauce
1/4 teaspoon dried basil
1/4 teaspoon crushed red pepper flakes
1/8 teaspoon garlic powder
1 pound bulk Italian sausage
1 medium onion, thinly sliced and separated into rings
8 slices part-skim mozzarella cheese
8 slices French bread (3/4 inch thick)
1/4 to 1/2 cup butter, softened

In a saucepan, combine the tomato sauce, basil, pepper flakes and garlic powder. Bring to a boil over medium heat. Reduce heat; simmer for 15 minutes.
Meanwhile, shape sausage into four thin oval patties. In a skillet over medium heat, cook patties until no longer pink; remove and keep warm.
In the drippings, saute onion until tender. Place a slice of cheese on four slices of bread; layer each with a sausage patty, onion and remaining cheese. Top with remaining bread. Butter the outsides of sandwiches.
On a griddle or in a large skillet, toast over medium heat until both sides are golden brown and cheese is melted. Serve with herbed tomato sauce for dipping. Makes 4 hearty sandwiches.

I got this from a taste of home cookbook and it's been a favorite around our house for quite sometime. Even with the onions, the kids always enjoy these!