This is our favourite "Oops, I forgot I said I'd bring a treat" recipe.

First part:
½ c Demerara or raw sugar
½ c soft butter
1 1/3 c whole wheat flour
 
Second part:
2 eggs
½ c honey
1 tsp vanilla
2 tbsp whole wheat flour
½ tsp salt
1 cup coconut
¾ c chopped nuts, optional
Blend first part and pat evenly into greased 9x12 inch pan. Bake on middle rack of oven at 350F for 10 minutes. Combine ingredients for second part, adding nuts and coconut last. Spread on top of baked crust. Return to oven and continue to bake for 20 minutes.
 
Taken from Natural Sweets and Treats by Ruth Laughlin