Inside-out Ravioli

• 2 eggs (beaten)
• 1 onion (chopped)
• 1 spaghetti sauce
• 450 gr beef (ground)
• 230 gr cheddar cheese
• 170 gr mozzarella cheese (shredded)
• 55 gr soft bread crumbs
• 3 gr salt
• 1 gr pepper
• 1 gr garlic powder