My ten year old discovered a version of these in the cookbook "Pretty Delicious" by Candice Kumai.  I have played around with her recipe and come up with a version, while perhaps not quite as healthy, absolutely scrumptious. Among other changes, I've added a cream cheese/maple icing and all sorts of lovely things such as citrus zest and golden sultanas (which I adore). I've left out the walnuts as my children don't like them, but if you do - add 1/2 cup.  You can still feel quite virtuous eating these knowing the oats are doing you good, in fact they have been eaten for breakfast on more than one occasion.  Even though I get a few complaints that there are no chocolate chips (although I don't really see why there couldn't be) these bars don't stick around too long. 

1 1/2 cups all purpose flour

1/2 teaspoon of baking soda

Pinch of salt

1/2 teaspoon of cinnamon

1/2 teaspoon of nutmeg

Zest of an orange

Juice of 1/2 an orange

Zest of a lemon

4 oz unsalted butter

1/3 cup of sucanat (or regular white sugar)

3 eggs

1 cup of maple syrup

1 tablespoon of vanilla extract

1/4 golden sultanas tossed in a tablespoon of flour

1/2 cup of oats

Icing;

2 oz unsalted butter (soft)

4 oz of cream cheese

1 teaspoon of vanilla extract

1 tablespoon of maple syrup

1 1/2 cups of confectioner's sugar

Heat the oven to 350F

If possible bring the butter and eggs to room temperature.

Cream the butter and the sucanat (or white sugar) with the orange and lemon zests until light and fluffy. 

Add the eggs, one at a time, scraping down the bowl after each addition.

Measure the flour, oats, salt, baking soda, cinnamon and nutmeg into a bowl.

Measure the maple syrup, orange juice and vanilla extract into a measuring jug.

Add half the flour mixture and gently combine, add the syrup mixture and combine and finish with the rest of the flour mixture.  Don't over beat.

Pour into a greased tin (I used 9 x 9) lined with parchment paper.

Place into the oven and bake for approx 40-50 minutes - or until slightly risen, cooked through and golden.

Remove from the oven and let cool completely.

To make the frosting beat all ingredients together until smooth.  You may need to add a little more syrup if too stiff or a little more confectioner's sugar if too runny.

Frost the top of the cake and then slice into bars.