Creamy bolognese pasta bake

Ingredients

• White sauce
• 50 gram butter
• 1/3 cup (50g) plain flour
• 2 cup (500ml) milk
• 1 tablespoon olive oil
• 1 onion, finely chopped
• 1 clove garlic, chopped
• 300 gram beef mince
• 400 gram can chopped tomatoes
• 2 tablespoon tomato paste
• 300 gram rigatoni or other short pasta
• 20 gram butter, melted
• 1/2 cup (40g) grated parmesan
• 2 eggs, lightly beaten