Delicious and Easy Sausage and Ricotta Stuffed Shells

Ingredients

• 8 large conchiglioni pasta shells (about 200g)
• 1 tablespoon olive oil
• 12 oz Italian sausage (casings removed)
• 1 cup ricotta cheese
• 1 cup shredded mozzarella cheese
• ½ cup grated Parmesan cheese
• 1 large egg
• 1 teaspoon salt
• ½ teaspoon black pepper
• 1 teaspoon dried oregano
• 1 teaspoon garlic powder
• 2 cups marinara sauce
• ½ teaspoon red pepper flakes (optional)
• Fresh basil leaves (for garnish)