Lingonberry squares

I tasted Lingonberry squares for the first time when my colleague baked them for a Friday coffee break when I still worked for the Quality Assurance department back in the very very old times.
They were sooo good! I just had to have the recipe. Recipe was actually available to all of us in "Sju sorters kakor" and was actually called "Syltrutor" which means Jam squares.

Being no friend of jam and supersweet stuff, I have decided to swap the lingonberry jam with some real lingonberry. 

2012-11-24 Lingonberry squares

Ingredients
 Dough
270gr flour
130gr caster sugar
1 tablespoon baking powder
150gr butter
1 egg

Topping
250gr lingonberries or more 

Crumbles
60gr oates
120gr caster sugar
1 teaspoon vanilla sugar
50gr butter

Instructions
Turn on the oven at 200 degrees (or 175 degrees with ventilation).
Mix sugar, flour and baking powder. Add butter in very small pieces and mix together. Add the egg and mix to get a well mixed dough.

Use a 20x30cm pan and put butter on in to achieve an even baking result.

Cover the pan with the dough. Add the lingonberries.

Mix oates, sugar, vanilla sugar and butter and distribute it evenly over the lingonberries.

Bake the cake for about 20min.

When cooled off, cut in squares.