Preheat oven to 180°C (350°F)
Melt butter in a medium/large saucepan over medium heat
Add flour and cook over medium heat, stirring constantly for 3-5 minutes to 'cook off' the flour. If you don't cook off the flour, the white sauce will taste 'floury'
Remove from heat, add milk ¼ cup at a time, stirring constantly between each addition until a smooth texture is obtained. Take your time between each addition to ensure you have all the lumps out. Taking short cuts here will result in a lumpy sauce (not nice)
Return to the heat and add chicken stock ¼ cup at a time, stirring constantly between each addition until a smooth texture is obtained
Add lemon juice, salt, and pepper and stir to combine
Add grated cheese and stir through until cheese has melted and the sauce is smooth and shiny.
Add chicken and corn and stir through. Pour into ramekins and set aside.
Crumb the slices of bread or tear into small pieces. Mix with the extra butter. (I put the bread and butter in a blender and blitzed for a few seconds). Divide the crumb mixture between the 6 ramekins
Place in the oven and cook for about 15 minutes or until the breadcrumbs are a golden brown and the mornay is bubbling around the edges. Serve on its own or with steamed veggies and crusty bread. Enjoy!