Crumb-Topped Blueberry Coffee Cake Recipe Type: Breakfast/Brunch Cuisine: American Author: Prickly Gourmet Prep time: 10 mins Cook time: 45 mins Total time: 55 mins Serves: 9 servings Ingredients Cake 1/4 cup butter, softened 2/3 cup granulated sugar 1 egg 1 cup plus 2 tablespoons all-purpose flour, divided 1/2 teaspoon baking powder 1/4 teaspoon kosher or