Blueberry Coffee Cake (aka Boy Bait) - Once Upon a Chef

Ingredients

• 6 tablespoons (packed) light brown sugar
• ½ cup all-purpose flour, (spooned into measuring cup and leveled-off)
• 1 teaspoon ground cinnamon
• ¼ teaspoon salt
• 4 tablespoons unsalted butter, (cold, cut into ½-inch (13-mm) chunks)
• 2 cups all-purpose flour, (spooned into measuring cup and leveled-off)
• 2 teaspoons baking powder
• ½ teaspoon salt
• 1/2 cup (1 stick) unsalted butter, softened
• ¾ cup granulated sugar
• 2 large eggs
• 1½ teaspoons vanilla extract
• 1 teaspoon (packed) lemon zest, (from 1 lemon)
• ½ cup milk
• 2 cups fresh blueberries ((frozen may be used but do not defrost))