Lemon Blueberry Pound Cake - Browned Butter Blondie

55min · 8 servings Cake 3/4 cup (170 g) unsalted butter, room temperature 1 cup (200 g) granulated sugar 2 tablespoons lemon zest 4 large eggs, room temperature 1 teaspoon vanilla extract 2 cups plus 2 tablespoons (265 g) all-purpose flour, divided 1 teaspoon baking powder 1/2 teaspoon salt 1/3 cup whole milk, room temperature 1/4 cup sour cream, room temperature (or full-fat Greek yogurt) 1 cup blueberries Glaze 1 1/2 cups (195 g) confectioners sugar, sifted 5–6 tablespoons whole milk or heavy cream 1/2 teaspoon vanilla 1/2 tablespoon Greek yogurt, to thicken the glaze (optional)