Peanut Butter Oatmeal Bars Recipe

"My mother used to make a cookie like this, known in her circles as "Peanut Butter Crunchies." I had been looking for something like this for a long time, and finally found it. Because I have changed my cooking to try to make everything a bit healthier, I tweaked the recipe as follows: Used organic everything. Changed Oatmeal to 2 1/4 C. Changed Flour to 1 1/4 C. Used less sugar, and used 1/4 C brown sugar and 1 C Coconut Palm sugar. Used 1 extra tsp vanilla. For the frosting, I used a Greek yogurt based frosting of 1 C plain Greek yogurt 2 tsp vanilla, and 3/4 cup powdered sugar then beat that together in the kitchen aid. Chilled it then added 1/2 C cup dark chocolate chips that I melted with 1/4 cup butter and then cooled to room temp. Put it all back in mixer and beat it again. Chilled it (this makes it frosting like instead of glaze like as the yogurt with less sugar has less thickness than butter and sugar.)"