This was better than I though and I thought it was going to be good!  If you like cinnamon you will like this.  Converted from this recipe.

1/2 teaspoon salt
2 1/2 cups GF Flour (I used this one)
1/2 teaspoon xanthan IF not in blend
1 1/2 teaspoons baking powder
1 cup butter, softened
1 cup sugar
1 cup brown sugar
3 eggs
1 teaspoon vanilla

Cinnamon Filling:
1 1/2 Tablespoons ground cinnamon
2 Tablespoons brown sugar

1 1/4 cup powdered sugar
3 Tablespoons milk
1/2 teaspoon vanilla

Preheat oven to 350 degrees
Spray 9X13 inch pan with spray oil or butter 

Cream butter and sugars.  Add eggs, vanilla and beat.  Add flour, baking powder, xanthan and salt.  Mix well.  
Spread half of dough into prepared pan.
Sprinkle the cinnamon sugar evenly over the dough.
Use a small scoop to evenly drop the rest of the dough over the cinnamon sugar. Carefully and lightly smooth out the dough.  
Bake 20-25 minutes.
Make the glaze and pour over hot bars.  Let cool before cutting – IF you can wait.  I couldn’t, they are delicious warm. 

Purchase “101 Gluten Free Recipes” cookbook here.
Thanksgiving Gluten Free eBook