Preheat the oven to 190°C (Gas Mark 5 / 375°F).
Add the oats, cheeses, melted butter, eggs, and chives to a large bowl and season generously. Mix thoroughly.
Grease a metal tin measuring approximately 6x6 inches, or 6 mini loaf tins. Distribute the oat mixture evenly, and press it gently into the corners of the tin.
Place in the oven, and bake for around 25 minutes, or until firm and golden brown.
Either serve warm, or transfer to a rack to cool. Store in an airtight container.