1. Turn oven on to around 200 degrees celsius.
2. Line baking tray with baking paper.
3. Make approx 3 inch cut in thick side of chicken fillets to make a pocket, but don't cut right through.
4. Fill pockets with brie.
5. Pour breadcrumbs/cornflake crumbs onto a plate.
6. Roll chicken in crumbs until coated - it doesn't have to be perfect, a few missed bits won't hurt.
7. Place crumbed chicken onto baking paper on baking tray.
8. Put 4 teaspoons of garlic butter onto each chicken fillet, or more if you like.
9. Bake for 20 - 30 minutes, depending on the thickness of the fillets.