Stuffed Ricotta Shells

INGREDIENTS

• 1 Tb. olive oil
• 20 jumbo pasta shells (half a 12 oz. box)
• 1 pinch of crushed pepper flakes
• 3 cups homemade marinara (or one large jar)
• 1 15 oz. container of ricotta cheese
• 2/3 cup parmesan cheese
• 1 egg
• 2 Tb. chopped Italian parsley
• 1 tsp. chopped fresh rosemary
• ¾ tsp. salt
• ½ tsp. pepper
• ½-1 cup mozzarella cheese