Heat oven to 350°F. Grease 12-cup Bundt® or 10-inch angel food cake (tube) pan; sprinkle with gluten-free flour blend. Set aside.
Combine the sugar and melted butter in large bowl. Beat at medium speed, scraping bowl often, until creamy.
Add 1 egg at a time, beating well after each addition. Continue the process until all the eggs have been incorporated.
Add the vanilla and mix until well blended.
Add the lemon zest and lemon juice, mixing until well combined.
Stir together the gluten-free flour blend and baking powder in small bowl.
Add one-third of the flour mixture to the mixing bowl.
After the first third of flour add half the milk. Add the next portion of flour into the batter, followed by the remainder of the milk and then the last portion of flour. Blend well after each addition.
Fold the blueberries into the batter and allow the batter to rest for 5 minutes.
Pour batter into prepared pan. Bake for 50 to 60 minutes or until a toothpick inserted in the center comes out clean.
Let the cake cool for 10 minutes then remove it from the pan. Allow the cake to fully cool.
Add the Glaze to the cooled cake