2 TBSP. sugar
1 1/2 TBSP. baking powder
pinch of salt
1/2 cup (1 stick) unsalted butter, cold
1 1/2 cups blueberries, fresh or frozen
1/2 cup whole milk
1 tsp. vanilla extract
1 cup icing sugar, sifted
1 TBSP. unsalted butter, melted
Zest from one lemon