Pizza Stuffed Pasta Shells

Bahan-bahan (16 porsi)

• 15 to 18 jumbo shells
• ½ pound lean ground beef
• 2 cloves garlic (minced)
• ½ onion (finely diced)
• 1 teaspoon dried oregano
• 4 ounces mini pepperoni (or sliced pepperoni, divided)
• 1 g reen bell pepper (diced)
• 1 large ripe tomato (seeded and diced)
• 1 cup pizza sauce
• 2 cups shredded mozzarella cheese (divided)