Meat Filled Manicotti

INGREDIENTS

• 1 (8 ounce) package manicotti pasta
• 1 pound lean ground beef
• 1 1/2 cups cottage cheese
• 2 cups shredded mozzarella cheese
• 1/2 cup grated Parmesan cheese
• 2 egg whites
• 1/2 teaspoon dried oregano
• 1 (32 ounce) jar spaghetti sauce