Slow-Cooker Meatball Sub with Homemade Marinara

Ingredients

• 2 large eggs, lightly beaten
• 1/4 cup whole milk
• 1/2 cup dry bread crumbs
• 2 tablespoons grated Parmesan cheese
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1/8 teaspoon garlic powder
• 1 pound ground beef
• 1/2 pound bulk Italian sausage
• SAUCE:
• 1 can (15 ounces) tomato sauce
• 1 can (6 ounces) tomato paste
• 1 small onion, chopped
• 1/2 cup chopped green pepper
• 1/2 cup dry red wine or beef broth
• 1/3 cup water
• 2 garlic cloves, minced
• 1 teaspoon dried oregano
• 1/2 teaspoon sugar
• 1/2 teaspoon pepper
• 6 Italian rolls, split
• Shredded Parmesan cheese, optional