Cheesy Stuffed Shells

INGREDIENTS

• 1 (16 ounce) package jumbo pasta shells
• 1/2 pound Italian sausage
• 1 (10 ounce) package frozen chopped spinach - thawed, drained and squeezed dry
• 1 cup ricotta cheese
• 1 egg
• 3 cloves garlic, crushed
• 1/2 lemon, juiced
• 1/4 cup grated Parmesan cheese
• salt and pepper to taste
• 1/2 teaspoon dried oregano
• 2 cups spaghetti sauce
• 2 cups shredded mozzarella cheese