Pizza Shells

1 . Stage

Place crushed tomatoes, canola oil, oregano, basil, and sugar into a large saucepan, cover, and bring to a boil. Reduce heat to a simmer, and cook the sauce, stirring frequently, until the flavors have blended, about 30 minutes.

2 . Stage

Preheat oven to 350 degrees F (175 degrees C).

3 . Stage

Fill a large pot with lightly salted water, and bring to a rolling boil. Stir in the shell pasta, and return to a boil. Cook the pasta uncovered, stirring occasionally, until the shells are cooked but still firm, about 10 minutes. Drain thoroughly.

4 . Stage

Mix the mushrooms, green pepper, and onion in a bowl. To stuff the shells, spoon about 1 teaspoon of tomato sauce into a shell; sprinkle with the mushroom, green pepper, and onion mixture. Top the shell with about 1 tablespoon of Monterey Jack cheese. Repeat for remaining shells and filling, and place the stuffed shells into a 9x13-inch baking dish side by side and touching. Place several slices of mini pepperoni on each shell. Pour the remaining tomato sauce gently around the shells.

5 . Stage

Bake in the preheated oven until the cheese is melted and browned and the pepperoni slices are crisp, about 30 minutes.