Testing new baking pan

I have a slight addiction to buying new bakeware and new gadgets for the kitchen. My latest purchase is a baking tray for individual traybakes from Lakeland - http://www.lakeland.co.uk/14230/My-Kitchen-Individual-Traybake-Pan. So perfect for brownies. My first attempt wasn't great as they were a nightmare to get out of the tray. Reading feedback on the Lakeland site it would seem I wasn't alone in this experience. I had found that the brownies that hadn't spilled over the edges of the individual trays came out the easiest so I had another go, this time only filling each tray half full. This time the results were perfect. So this is the recipe I used (a family recipe we first found on the back of a Sainsbury's chocolate chip packet and which I've adapted over the years).

Chocolate Chip Brownies

130g (5oz) butter

350g (12oz) caster sugar

130g (5oz) self-raising flour sifted with 30g (1oz) cocoa powder

100g (4oz) plain chocolate chips

100g (4oz) pecan or walnut pieces (optional)

4 medium eggs (beaten)

1 tsp vanilla extract

1. Preheat oven to 170°C (fan) or 190°C (conventional).
2. Grease the individual traybake pan.
3. Melt butter and stir in sugar.
4. Beat in remaining ingredients and put into the greased tin. (I tend to use an ice cream scoop as it's easier to get into the pan). Make sure you only fill each compartment half full. Better to underfill than overfill!

5. Bake in a preheated oven 170°C (fan) or 190°C (conventional) for 15-20 mins.
6. Leave in tin to cool, then carefully place a palette knife down each edge and carefully lift out of the tin.

If you need to re-use the tin then you can lift the cakes out warm but do so very carefully. 

And the final result:

This recipe made about 15 pieces so you can do the last 3 in the tin again or do the remaining ones in a standard cupcake tray. I suspect cutting the recipe down to the quantities below would fit 12 exactly but I've not tested it.
98g butter
263g caster sugar
98g self-raising flour sifted with 22g cocoa powder
75g plain chocolate chips
75g pecan or walnut pieces (optional)
3 medium eggs
0.75 tsp vanilla extract

Next time I shall try this recipe to try and find an exact fit for the tin, and would welcome anyone elses recipes to try.