Name: Blueberry Coffee Cake
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Yield: 16 Servings
Ingredients: 1 cup brown sugar (, packed); 2/3 cup flour; 1/2 teaspoon cinnamon; 1/2 cup unsalted butter (, cold and cut into cubes); 1/2 cup unsalted butter; 1 cup sugar; 1 large egg; 2 teaspoons vanilla extract; 2 cups flour; 2 teaspoons baking powder; 1/2 teaspoon salt; 3/4 cup whole milk; 2 cups blueberries; 1 tablespoon cornstarch