Orange Raisin Oatmeal Cookies

I have been in love with orange peel and lemon peel for quite some time. Any recipe that contains either ingredient has got my immediate attention. Both have such authentic, strong and fresh flavor - I love their boldness and I often use double the amounts than stated in the recipe.
This cookie has become a regular in our house, after I started adding the orange peel. It's not an overtly sweet cookie. Little agave syrup, mashed banana and raisins provide most of it. In my opinion, it doesn't need more as the orange flavor does all the work. If you like it sweeter, do it with the icing. Walnuts give them a crunch. To me, this cookie fall in the category "No-Guilt" and "Extremely Yummy".

3/4 cups whole wheat pastry flour
3/4 cup rolled oats (quick-cooking)
1/2 teaspoon salt
1/4 teaspoon baking soda

1/3 cup butter, softened
1/3 cup agave syrup
1 egg
1 orange, peel of
1 large ripe banana, mashed

1/4 cup walnut, chopped
3/4 cup raisins

Orange Sugar Frosting (Optional)
100g icing sugar
3 tablespoon of fresh orange juice

Yields ca. 20
Preheat oven to 180C. Line a baking sheet with parchment paper.

Combine all dry ingredients in a bowl. Mix well. In another bowl, cream together butter, agave and orange peel. beat in the egg. Add mashed banana and stir until all is well combined. Stir in walnuts and raisins. Combine flour mixture and wet ingredients and mix well. Form 1-inch balls out of the dough, then press the ball between the palm of your hands to form a disc. Place on baking sheet and bake for 10-12 minutes. Let cookies cool on a wire rack.
In the meantime, prepare the frosting. Stir in 3 tablespoons of orange juice into the icing sugar. Coat the tops of the cookies with the frosting. Let stand until frosting becomes solid.