Preheat oven to 325°F (165°C). Grease and flour 10-inch bundt pan.
Mix flour, baking powder, and salt. Toss ¼ cup flour mixture with blueberries.
Cream butter and sugar until fluffy (5 minutes).
Add eggs one at a time, then vanilla and zest.
Alternate adding flour mixture and milk to butter mixture.
Fold in blueberries gently.
Bake 75-85 minutes until done.
Cool 20 minutes before removing from pan.
Mix glaze ingredients and drizzle over cooled cake.