Name: Crumble-Topped Blueberry Buttermilk Coffee Cake
Prep time: 15 min
Cook time: 1 h 15 min
Total time: 1 h 30 min
Yield: 1 (9-inch) coffee cake, about 8 servings
Ingredients: ½ cup (100 g) sugar; ¾ cup (96 g) all-purpose flour; ⅛ teaspoon fine salt; ½ teaspoon pure vanilla extract; 6 tablespoons unsalted butter, at room temperature; 2 cups (255 g) all-purpose flour; 1½ teaspoons baking powder; ½ teaspoon baking soda; ½ teaspoon fine salt; 4 tablespoons unsalted butter, at room temperature; 4 tablespoons avocado oil (or other neutral-flavored oil); 1¼ cups (250 g) sugar; 2 large eggs; ¾ cup (180 ml) buttermilk; 1½ teaspoons pure vanilla extract; 1½ cups (210 g) fresh blueberries