Place apricots, water and granulated sugar in a medium-size saucepan.
Bring to a boil, stir often. Reduce to a simmer and cook until mixture is thickened, stirring occasionally (approximately 4 - 6 minutes)
Remove from heat and add the gluten-free flour. Stir until absorbed.
Set aside to cool completely.
Make Cookie Base
Preheat oven to 350° F
Sift or whisk together flour, baking soda, cinnamon and salt.
Place softened vegan butter and brown sugar in the bowl of a stand mixer. Using the paddle attachment begin mixing on medium speed. Continue to mix until the butter and sugar mixture is light and fluffy (approximately 2 - 3 minutes). Note: a hand mixer may also be used
Add the flour, baking soda and salt mixture to the mixing bowl. Mix for 20 - 30 seconds or until all the dry ingredients are absorbed.
Remove the bowl from the mixer and stir in the oatmeal. Note: the dough will be crumbly.
Pour half of the dough into the bottom of the prepared pan. Using your hands, lightly press the dough down so it evenly covers the bottom of the pan.
Pour the apricot mixture over the dough in the pan and spread evenly.
Sprinkle the second half of the dough over the apricots so it is evenly distributed.
Bake
Bake for 25 - 30 minutes. Cool completely before removing from pan.