Classic Ricotta Lasagna

Ingredients

• 2 tablespoons olive oil
• 1 medium onion, diced
• 2 cloves garlic, minced
• 1 pound ground beef or turkey
• 1 can crushed tomatoes (28 ounces)
• 1 teaspoon dried oregano
• 1 tablespoon sugar
• Salt and pepper to taste
• 15 ounces ricotta cheese
• 1 cup grated Parmesan cheese
• 1 large egg
• 1 teaspoon dried basil
• 12 sheets of lasagna noodles
• 3 cups shredded mozzarella cheese