This is a family favourite! It was hand written in my late mothers recipe scrap book, and is a staple on our farm, especially at seeding and harvest. I guarantee it will become your favourite too! —Mesha
Lightly grease a large, deep slice tin. About 23cm X 32cm. Line with greaseproof paper.
Combine butter, sugar, eggs and essence in a bowl. Add sifted flour and rolled oats. Mix well. Press two thirds of this mixture evenly over the base of tin. Save the remainder for the topping.
Chocolate walnut fillling
Combine chocolate, condensed milk, and butter in a saucepan over a low heat. Stir until chocolate has melted. Add nuts and vanilla. Mix well. Spread onto the base.
Crumble remaining base, evenly over the filling. Bake in a moderate oven for about 30 minutes, or until just golden. Remove from the oven and cool on a rack. When cool, refrigerate until cold, then cut into yummy slices!!