Preheat oven to 350 degrees.
Grease and flour (with gluten free flour) very generously, 35 miniature Bundt pans.
Melt butter and set aside.
In a small mixing bowl, combine gluten free flour, baking powder, baking soda and salt.
Set aside.
In a medium mixing bowl, combine monk fruit sugar and eggs.
Mix on medium speed for 2 minutes to allow plenty of air to fluff the batter.
Add melted butter to sugar/egg mixture and mix again.
Add vanilla, lemon extract, lemon zest and lemon juice and mix again.
Finally, add the sour cream and mix one more time.
Add dry ingredients and blueberries and mix well.
Spoon batter into 35 prepared miniature Bundt pans.
Bake at 350 degrees for 17-20 minutes or until a toothpick inserted in center comes out clean.
Remove from oven.
Allow cakes to cool completely before transferring to a wire rack.
Prepare icing.
Glaze individual tea cakes with the icing.
Sprinkle with lemon zest if desired.
Place a fresh blueberry in the center of each cake.