Easy-peasy oat crunchies

Now that I am at home full time I have re-discovered my copy of Delia Smith's Complete Cookery Course. This book tells you how to boil an egg properly (and I found I've been doing it wrong all these years!) and it also contains a recipe for oat crunchies which I made for the first time the other day. Very easy and very nice! Here is my slightly amended version:

Ingredients
110g (1.5 cups) oats
75g (1/3 cup) light brown sugar
110g (1 stick) margarine or butter

Preheat oven to 375oF, 190oC or gas mark 5.
Grease a 9x9 inch cake or brownie tin.

Put the oats and sugar in a bowl and mix together well. Gently melt the butter being careful not to let it brown. Pour the melted butter into the bowl and mix well. Tip the mixture into the cake tin and press down evenly with your hand (the crunchies will be quite thin).

Bake for 15 minutes until they are pale golden brown. Remove from oven and cut into 12 portions with a spatula while still warm. Leave in the tin until cold and crisp then store in an airtight tin.