Name: Blueberry-Raspberry Muffins with Streusel Topping
Yield: 1 dozen muffins
Ingredients: Topping:; 1/4 cup all-purpose flour; 2 tablespoons butter, softened; 2 tablespoons sugar; 2 tablespoons finely chopped walnuts; 1 teaspoon finely grated lemon peel; Muffins:; 2 cups all-purpose flour; 2/3 cup sugar; 2 teaspoons baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon salt; 1/4 teaspoon ground cinnamon; 2 large eggs; 1 stick unsalted butter, melted; 1 cup buttermilk; 1 tablespoon grated lemon zest; 3/4 cup fresh blueberries; 3/4 cup fresh raspberries