Name: Best Blueberry Muffins with Streusel Topping
Prep time: 15 min
Cook time: 25 min
Total time: 45 min
Yield: 12-14 muffins
Ingredients: 1/2 cup (100g) packed light or dark brown sugar; 1/2 cup (67g) chopped walnuts (or pecans); 1 teaspoon ground cinnamon; 1 and 3/4 cups (220g) all-purpose flour (spoon & leveled); 1 teaspoon baking soda; 1 teaspoon baking powder; 1/2 teaspoon salt; 1/2 cup (115g) unsalted butter, softened to room temperature; 1/2 cup (100g) granulated sugar; 1/4 cup (50g) packed light or dark brown sugar; 2 large eggs, at room temperature; 1/2 cup (120g) sour cream or plain/vanilla yogurt, at room temperature; 2 teaspoons pure vanilla extract; 1/4 cup (60ml) milk; 1 and 1/2 cups (250g) fresh or frozen blueberries