Preheat oven to 350 degrees. Spray 9x13 baking pan with nonstick cooking spray.
In medium bowl, sift together flour blend, baking powder and salt. Set aside.
In bowl of stand mixer, beat together powdered sugar, sugar, coconut oil, coconut milk and vanilla until creamy. Add flour mixture and continue to mix until combined.
Using rubber spatula, spread dough in even layer in prepared baking pan.
Bake cookies for 22-24 minutes, or until edges are golden brown. Remove from oven and place pan on cooling rack to cool completely.
To make vanilla frosting, mix together powdered sugar, softened vegan butter, coffee creamer and vanilla. Beat until smooth and creamy.
Add a few drops of food coloring (if desired). Spread frosting over top of cooled cookies. Sprinkle with colored sprinkles.
Allow frosting to set. Cut cookies into bars and serve.
Recipe by Sarah Bakes Gluten Free at https://www.sarahbakesgfree.com/2016/03/gluten-free-vegan-frosted-sugar-cookie-bars.html