Preheat oven to 375F. Grease a donut pan with 6 wells with cooking spray (make sure it does not have flour in it).
In a large bowl, mix together gluten-free flour blend, granulated sugar, baking powder, baking soda and salt.
Then, add in vanilla, apple cider vinegar, almond milk and vegetable oil. Whisk until smooth. Then fold in the diced strawberries.
Spoon or pipe batter into the donut pan. The batter should just about reach the top of the pan.
Bake at 375F for 10-14 minutes or until the donuts spring back when you touch them. Let cool in the baking pan for only a few minutes and finish cooling on a wire rack.
To make the glaze, add the strawberries, powdered sugar and one tablespoon of the water to a food processor. Process until smooth. Add more water if you need to thin out the glaze a bit.
Dip the donuts into the glaze and place on a wire rack to set. Donuts are best eaten on the same day.